▲根据首字母及句意写出单词的正确形式
1. My sister bought a new coat which c______ her five dollars.
2. The weather here is n______ very hot nor very cold in spring. It's a good time to go out and have fun.
3. — Our math teacher is really good! — It s______ that you all like him.
4. Mr. White has gone to the city library. He will come back i______ an hour.
5. Practice makes perfect. The h______ you work, the better your English will be.
6. — How long has the young skater been s______ today? — For about three hours.
7. Excuse me, your car is in the way. Would you mind m______ it?
8. Why not h______ a good rest after such a long time of hard work?
9. We want to sell some of our things in a yard sale and give the money to the C______ Home.
10.Western children are now getting i______ in the story of Monkey King.

解：
1. 分析：句子时态为一般过去时，“cost”（花费）的过去式还是“cost”，“which cost her five dollars”是定语从句，修饰“a new coat”。
答案：cost。
2. 分析：“neither...nor...”（既不……也不……）是固定搭配。
答案：neither。
3. 分析：“It seems that...”（似乎……）是固定句型，主语是“It”，句子时态为一般现在时，所以用“seems”。
答案：seems。
4. 分析：“in + 一段时间”表示“在……之后”，常用于一般将来时。
答案：in。
5. 分析：“the + 比较级，the + 比较级”（越……，越……），“hard”的比较级是“harder”。
答案：harder。
6. 分析：“has been + 现在分词”构成现在完成进行时，“skate”（滑冰）的现在分词是“skating”。
答案：skating。
7. 分析：“mind doing sth.”（介意做某事），“move”（移动）的动名词是“moving”。
答案：moving。
8. 分析：“Why not + 动词原形”（为什么不……），“have a rest”（休息）是固定短语。
答案：have。
9. 分析：“Children's Home”（儿童之家）是固定表达。
答案：Children's。
10. 分析：“get interested in...”（对……感兴趣）是固定短语。
答案：interested。

▲根据句意写出动词的正确形式
1. I ______(meet) an old friend last night.
2. Yang Liwei ______(be) a hero in China. He ______(fly) around the earth in 2003.
3. We ______(read) books while they ______(watch) TV at eight yesterday morning.
4. Jim ______(ride) home when it ______(start) to rain last night.
5. They ______(climb) the mountain yesterday morning, and ______(swim) in the river in the afternoon.
6. ______ the boy ______(ride) a bike at this time yesterday?
7. We are talking about where ______(fly) kites this weekend.
8. This movie is the most exciting one that I ______(watch).

解：
1. 由“last night”可知句子是一般过去时，meet的过去式是met，所以填met。
2. 杨利伟是中国的英雄，这是客观事实，用一般现在时，主语Yang Liwei是第三人称单数，be动词用is；“in 2003”表明是过去的时间，fly的过去式是flew，所以依次填is，flew。
3. “at eight yesterday morning”表示过去具体的时间点，while连接的两个动作同时进行，用过去进行时，其结构是$was/were + 现在分词$，主语We是复数，用were reading；主语they是复数，用were watching，所以依次填were reading，were watching。
4. “last night”表明是过去的时间，“when”引导的时间状语从句，主句用过去进行时，从句用一般过去时。主句主语Jim是第三人称单数，用was riding；start的过去式是started，所以依次填was riding，started。
5. “yesterday morning”和“in the afternoon”表明是过去的时间，climb的过去式是climbed，swim的过去式是swam，所以依次填climbed，swam。
6. “at this time yesterday”表示过去具体的时间点，用过去进行时，其一般疑问句结构是$Was/Were + 主语 + 现在分词 + 其他$，主语the boy是第三人称单数，用Was，ride的现在分词是riding，所以依次填Was，riding。
7. “where to do sth.”是“疑问词+不定式”结构，在句中作宾语，所以填to fly。
8. “This is the most...that...”结构中，that从句常用现在完成时，其结构是$have/has + 过去分词$，主语I是第一人称，用have watched，所以填have watched。
综上，答案依次为：1. met；2. is，flew；3. were reading，were watching；4. was riding，started；5. climbed，swam；6. Was，riding；7. to fly；8. have watched。