I. Vocabulary: Fill in the blanks with the words and expressions given below, changing the form where necessary.

1. The doctor _________ the patient's stomach to feel for problem.
   
2. They ________ against entry by unauthorized persons.
   
3. Automakers ________ their cars to make sure they are safe.
   
4. People _________ their dogs to sit and stay.
   
5. I _________ that there was a leak in the ceiling.
   
6. He lost his ________ in an accident.
   
7. Farmers _________ their corn when it is ready.
   
8. My real ambition was to work at a________.
   
9. The fireman received a _________ for his bravery.
   
10. Your only fault is that you won't concentrate.
    

II. Structure: Make sentences after the model.

1. Model: It takes two skilled workers to repair the machine within one day.

1) It takes us half an hour to _____________________.
2) It took me one day to _________________________.

2. Model: It is important to study English.

1) It is possible to ________________________________.
2) It is difficult to ___________________________.

3. Model: As we know, it is important to protect our environment.

1) As we know, _________________________________.
2) ________________________, as we know.

4. Model: We can strengthen our ties with them only by doing so.

1) We learn to swim by _______________________________.
2) You can improve your English by ________________.

5. Model: The sun warms the earth, which makes it possible for plants to grow.

1) This is the museum, which _____________________________.
2) The sweater, which _______________, is too small for me now.

III. Translation: Translate the following sentences into English.

1. 图书馆里许多书不见了。
   
2. 我叫他们当心人行道上路滑的地方。
   
3. 在你打开水龙头之前，要想一想：你是否真正需要水？
   
4. 老板警告工人迟到的后果。
   
5. 新型计算机的速度不断加快。