一、用括号内所给词的正确形式填空。
1. —Have you enjoyed your visit here?
—Yes. I'll be very sorry ________ (leave).
2. —I'll help you whenever you need me.
—Good. I'd like you ________ (help) me look after my dog tomorrow.
3. —Where did he go?
—He went to another store ________ (buy) pencils.
4. The girl has a heart disease. The doctors find it difficult ________ (treat) her.
5. —Did the man ask you many questions?
—Yes, and they were difficult ________ (answer).
6. Last summer I took a course on how ________ (make) cookies.
7. I was surprised ________ (watch) him eat so quickly.
8. Have you decided where ________ (go) next month?
9. The boy wanted to ride his bicycle in the street, but his mother told him ________ (not do) that.
10. It's too hard for me ________ (throw) the ball into the basket.

1. to leave 2. to help 3. to buy 4. to treat
5. to answer 6. to make 7. to watch 8. to go
9. not to do 10. to throw

二、根据汉语意思完成下列句子。 每空一词。
1. 成功的关键在于从错误中学习，并且永不放弃。
The key to success is ________ ________ ________ your mistakes and never give up.
2. 他取掉他贵重的手表是为了隐藏他富有的事实。
He took off his expensive watch ________ ________ the fact that he was rich.
3. 出发前，记得给我打个电话，以便我知道什么时间来接你。
Remember ________ ________ me before you set off so that I can know when ________ ________ you up.
4. 我弟弟有时会做奇怪的事情来获得妈妈的关注。
Sometimes, my brother would do something strange ________ ________ my mother's attention.
5. 我们的老师总是告诫我们，在学习中不要逃避任何困难。
Our teacher always tells us ________ ________ ________ away from any difficulties in the study.

1. to learn from 2. to hide 3. to call; to pick 4. to get / attract 5. not to keep