A. 用所给单词的适当形式填空。
1. Life in the 21st century is full of hope and (challenge).
2. These (instruct) will teach the students more about the sport and how to do it.
3. I will always remember the last winter, especially playing in the snow and (ski).
4. I enjoy (program) a lot. It's super cool to create my own apps!
5. My sister and her friends often (express) their ideas through pictures.

1. challenges
2. instructors
3. skiing
4. programming
5. express

1. 句中and连接并列成分，前面的hope为名词，challenge是可数名词，此处表示泛指各类挑战，需要用复数形式challenges。
2. 空格前的These后面要接可数名词复数，动词instruct需要转化为表示身份的名词instructor（指导者/教练），复数形式为instructors，符合句意“这些教练会教学生更多关于这项运动的知识以及如何做这项运动”。
3. 句中and连接并列的动名词，和前面的playing in the snow对应，动词ski要变为动名词形式skiing。
4. 固定搭配enjoy doing sth. 表示“喜欢做某事”，动词program（编程）的动名词形式为programming。
5. 主语My sister and her friends是复数，often是一般现在时的标志词，谓语动词用原形express即可。

B. 根据句意,用方框中所给单词的适当形式填空。
return single poem deal stroke
1. Mr Hu went to Beijing last Sunday and will tomorrow.
2. She made a few on the paper and then a picture of a lovely cat appeared.
3. There's a apple left in the basket. Who wants it?
4. The teacher with the argument between the two students yesterday.
5. All of the students learned some short by Li Bai in their last Chinese class.
C. 请选择你喜欢的一项业余活动,根据自身实际情况完成下面任务。
| What is the activity? | It is 1. . |
| When did it start? | It started 2. . |
| When do you do it now? | 3. |
| Where do you do it? | 4. . |
| Why do you like it? (within 10 words) | I like it 5. . |
【Language Focus】
My twin brother and I look alike, but we are so different. I love sports, and I often meet my friends 1. (play) football and tennis. My brother joined us to play football once or twice, but he decided 2. (not come) after that. He doesn't like sports very much! Instead, he likes 3. (stay) at home and 4. (watch) movies, 5. (listen) to music, and 6. (chat) with friends online. Our parents were worried about him staying at home too much. They also wanted us 7. (spend) more time together as a family. So, now they let us 8. (do) our favourite activities on Saturdays, but on Sundays, we go on a family outing together!
任务一:请在横线处写出动词的正确形式。
任务二:在下列表格中将短文中的动词不定式按成分进行归类,并找出含有动词不定式的否定形式,以及不带to的动词不定式的句子。
| 作目的状语 | 作宾语 | 作宾语补足语 |
| --- | --- | --- |
| 1. | 2. | 3. |
| | | |
4. 含有动词不定式的否定形式的句子:
5. 含有不带to的动词不定式的句子:

B部分：
1. return
2. strokes
3. single
4. dealt
5. poems
C部分（参考示例，合理即可）：
1. running
2. when I was 7 years old
3. I go running every weekend morning
4. In the community park near my home
5. because it keeps me fit
Language Focus任务一：
1. to play
2. not to come
3. staying
4. watching
5. listening
6. chatting
7. to spend
8. do
任务二：
1. to play football and tennis; to play football
2. not to come
3. to spend more time together as a family; do our favourite activities
4. My brother joined us to play football once or twice, but he decided not to come after that.
5. So, now they let us do our favourite activities on Saturdays, but on Sundays, we go on a family outing together!

B部分：
1. 句意：胡先生上周日去了北京，明天就会返回。情态动词will后接动词原形，return意为“返回”，符合语境。
2. 句意：她在纸上画了几笔，随后一只可爱的小猫的图案就显现出来了。a few后接可数名词复数，stroke作名词意为“笔画”，复数形式为strokes。
3. 句意：篮子里只剩一个苹果了，谁想要它？single意为“单一的，仅一个的”，a single apple是常用搭配，符合句意。
4. 句意：老师昨天处理了两名学生之间的争执。deal with是固定搭配，意为“处理”，时间状语yesterday表示一般过去时，deal的过去式为dealt。
5. 句意：所有学生在上节语文课上学了几首李白的短诗。some后接可数名词复数，poem意为“诗歌”，复数形式为poems。
C部分：本题为开放性试题，选择任意合理的业余活动，结合自身实际填写即可，给出符合要求的参考示例。
Language Focus任务一：
1. 此处用不定式作目的状语，表“见朋友”的目的是踢球，填to play。
2. 固定结构decide not to do sth. 意为“决定不做某事”，填not to come。
3-6. 固定搭配like doing sth. 表示长期的爱好，and并列多个动名词作like的宾语，因此依次填staying, watching, listening, chatting。
7. 固定结构want sb. to do sth. 意为“想要某人做某事”，不定式作宾语补足语，填to spend。
8. 固定结构let sb. do sth. 意为“让某人做某事”，接不带to的不定式，填do。
任务二：
根据不定式的语法功能分类：作目的状语的不定式用来表示动作发生的目的；作宾语的不定式放在及物动词后充当宾语；作宾语补足语的不定式用来补充说明宾语的动作，再定位原文对应内容即可。