A. 根据句意、中文释义、首字母和音标提示，写出句中所缺单词。
1. Students should learn how to keep a
(平衡) between schoolwork and hobbies.
2. I like to live in the
(乡村) because I like the fresh air there.
3. My family plan to go for a
(野餐). We are thinking about the place now.
4. Drinking a glass of milk can help you fall
(睡着) quickly.
5. With the s
from my parents, I tried out for the school basketball team.
6. The Maths problem is too difficult. N
of the students can solve it.
7. Please speak c
, so everybody can hear you.
8. He took out his
(/ˈkæmrə/) to catch the happy moment.
9. The cycling trip was so
(/ɪnˈdʒɔɪəbl/) that we wanted a second time.
10. Don’t worry! You still have one more
(/tʃɑːns/).
解析：
1. 考查固定搭配，根据中文提示“平衡”，固定短语keep a balance意为“保持平衡”，空处填名词balance。
2. 考查名词，根据中文提示“乡村”，固定搭配in the countryside意为“在乡村”，填countryside。
3. 考查固定搭配，根据中文提示“野餐”，go for a picnic是固定短语意为“去野餐”，填picnic。
4. 考查固定搭配，根据中文提示“睡着”，fall asleep是固定短语意为“入睡、睡着”，填asleep。
5. 考查名词，根据首字母s和句意“在父母的______下，我参加了校篮球队的选拔”，空处填名词support（支持）符合语境。
6. 考查代词，根据前句“这道数学题太难了”和首字母N，none of...表示“没有一个”，符合“没有学生能解出它”的句意，填None。
7. 考查副词，根据后半句“这样所有人都能听到你”和首字母c，修饰动词speak要用副词clearly（清楚地），填clearly。
8. 考查音标对应单词，音标/ˈkæmrə/对应的单词是camera（相机），符合“他拿出相机记录快乐时刻”的句意。
9. 考查音标对应单词，音标/ɪnˈdʒɔɪəbl/对应的单词是enjoyable（令人愉快的），放在so后作表语，符合骑行旅行的语境。
10. 考查音标对应单词，音标/tʃɑːns/对应的单词是chance（机会），one more后接可数名词单数，符合句意。
