一、根据括号内所给汉语注释写出单词的正确形式(每空一词)
1. Our teacher says (龙卷风) happen more often in America than in China.
2. Our team won the game (完全彻底)—the score was 5:0!
3. The forest has (浓密) trees—sunlight can hardly reach the ground!
4. The little cat (躲藏) under the sofa when it heard loud thunder.
5. The wind blew hard and the rain (敲;打) against the window heavily yesterday evening. We were scared.
6. When the (电力供应) went out, our classroom became dark.
7. Our teacher (提醒注意) us of the heavy rain, so we took umbrellas to school.
8. While my parents were packing (补给), I moved our things off the floor.

1. tornadoes 2. soundly 3. thick 4. hid 5. beat 6. power 7. warned 8. supplies

【解析】
1. 此处作宾语从句的主语，根据谓语动词happen为原形，可知主语用复数形式，“龙卷风”的复数是tornadoes。
2. 此处修饰动词won，需用副词，“完全彻底”的副词形式是soundly。
3. 此处修饰名词trees，需用形容词，“浓密”的形容词是thick。
4. 根据时间状语从句中的heard为过去式，可知主句用一般过去时，“躲藏”的过去式是hid。
5. 根据时间状语yesterday evening，可知用一般过去时，“敲；打”的过去式是beat（原形与过去式同形）。
6. “电力供应”对应的英文单词是power，此处作主语，用原形即可。
7. 根据后半句的took为过去式，可知主句用一般过去时，“提醒注意”的过去式是warned。
8. “补给”常用复数形式supplies，pack supplies表示打包补给品。
【答案】
1. tornadoes 2. soundly 3. thick 4. hid 5. beat 6. power 7. warned 8. supplies
【知识点】
名词单复数、动词时态、形容词副词用法
【点评】
本题考查英语词汇在具体语境中的正确形式运用，涵盖名词、动词、形容词、副词等多种词性的变化，需要结合语境、语法规则判断单词的适当形式，注重对基础词汇变形能力的考查。
【难度系数】
0.6

二、用所给单词的适当形式填空
1. While I (shop) this morning, I (lose) my money. I don't know how.
2. I (listen) to the news on the radio when the phone (ring).
3. While I (go) to school this morning, I (meet) an old friend.
4. When I (leave) home this morning, my mother (sweep) the floor.
5. —What (happen) to Tom?
—He fell off his bike and hurt his arms.
6. Minnie said that it (snow) at this time yesterday.
7. I (work) on the computer when Frank called me last night.
8. As Susan (wait) for the bus, a car accident happened.
9. I was cooking dinner while he (play) the piano.
10. While the teacher (give) a lesson, Jack was taking notes.

1. was shopping, lost 2. was listening, rang 3. was going, met 4. left, was sweeping 5. happened 6. was snowing 7. was working 8. was waiting 9. was playing 10. was giving

【解析】
这些题目主要考查过去进行时和一般过去时的时态搭配：
1. while引导时间状语从句，从句表过去正在进行的动作，用过去进行时was shopping；主句是短暂性动作，用一般过去时lost。
2. when引导时间状语从句，主句表过去正在进行的动作，用过去进行时was listening；从句是短暂性动作，用一般过去时rang。
3. while引导从句，用过去进行时was going；主句是短暂性动作，用一般过去时met。
4. when引导从句，从句是短暂性动作left；主句表过去正在进行的动作，用过去进行时was sweeping。
5. 根据答语的一般过去时，问句用一般过去时happened。
6. 根据时间标志词at this time yesterday，用过去进行时was snowing。
7. 根据when Frank called me last night，主句用过去进行时was working。
8. as引导时间状语从句，从句表过去正在进行的动作，用was waiting。
9. while引导并列的过去进行时，表前后动作同时进行，用was playing。
10. while引导从句，用过去进行时was giving。
【答案】
1. was shopping, lost
2. was listening, rang
3. was going, met
4. left, was sweeping
5. happened
6. was snowing
7. was working
8. was waiting
9. was playing
10. was giving
【知识点】
过去进行时用法、一般过去时用法、时态搭配规则
【点评】
本题聚焦过去进行时与一般过去时在时间状语从句中的搭配，需区分while/when/as引导从句时的时态差异，以及不同时间标志词对应的时态，是初中英语时态的基础核心考点，需熟练掌握两种时态的适用场景。
【难度系数】
0.7

三、按要求完成下列句子
1. She was reading a book when I saw her. (对画线部分提问)
was she when you saw her?
2. I was introducing my hometown when you called me up. (对画线部分提问)
What you when I called you up?
3. We were having a class when we heard the exciting news. (改为否定句)
We a class when we heard the exciting news.
4. David is playing basketball now. (用 at that time 替换 now 改写句子)
David basketball at that time.
5. I was reading in the library when it started to snow. (改为同义句)
I was reading in the library, it to snow.

1. What, doing 2. were, doing 3. weren't having 4. was playing 5. When/While, started

【解析】
1. 对过去进行时的动作提问，用特殊疑问词What，原句为过去进行时，故be动词was后接doing替代画线动作，saw为过去式，时态保持一致。
2. 对过去进行时的动作提问，主语I变为you，对应的be动词用were，后接doing构成过去进行时的疑问结构。
3. 过去进行时的否定形式是在be动词后加not，were not缩写为weren't，现在分词having保持不变。
4. at that time是过去时间状语，时态需从现在进行时转为过去进行时，主语David是第三人称单数，be动词用was，现在分词playing不变。
5. 原句是when引导的时间状语从句，可转换为When/While引导的从句，主句用一般过去时started，与原句时态逻辑一致。
【答案】
1. What, doing
2. were, doing
3. weren't having
4. was playing
5. When/While, started
【知识点】
过去进行时用法、句式转换
【点评】
本题围绕过去进行时展开多种句式变换考查，包括特殊疑问句、否定句、时态改写及同义句转换，需熟练掌握过去进行时的结构及不同句式的变化规则，加深对该时态语境运用的理解。
【难度系数】
0.8