1. Study harder, or you won't catch up with others.
    ______ ______ ______ study harder, you ______ fall behind others.
2. My brother didn't go to work. He stayed at home, instead.
    My brother ______ at home ______ ______ ______ to work.
3. How do you like his idea?
    ______ do you ______ his idea?
4. She has a headache.
    She has ______ ______ ______ in her head. Her head hurts.
5. My mother bought me a bike as a birthday present.
    A bike ______ ______ ______ ______ by my mother as a birthday present.

A. come　　　　　　
B. will come　　
C. comes　　　　　
D. came

A. doesn't
B. don't
C. isn't
D. won't

A. work; is
B. works; is
C. works; will be
D. will work; will be

A. If she comes
B. If she will come
C. If she doesn't come
D. If she didn't

A. die, die
B. will die, die
C. die, will die
D. will die, will die

1. If it             (rain) tomorrow, we _______ (not go) to the park.
2. The heavy rain prevented us _______ (play) football.
3. The teacher often tells us _______ (not make) any noise in class.
4. The doctor asked me ______ (take )the medicine three times a day.
5. When I met my friend on my way, I stopped             (talk) with him.
6. So much work usually makes him ______ (feel) very tired.
7. Sorry, we are late. We ______ (not catch) the bus.
8. There are not many cranes ______ (live) in the world.

1. I will go the park tomorrow.  I have time. 
                                                                          
2. They stay in the desert.  They will see the camels.
                                                                          
3. Tigers are in danger.  They attack people.
                                                                          
4. Elephants are thirsty.  They go to the river.
                                                                          
5. Giant pandas have no food.  They die.
                                                                          

[     ]

A: finish
B: will finish
C: am finishing
D: finished

1. If you _________ (not be) careful enough when crossing the road, a car may hit you.
2. By the time he got home, his wife _________ (do) all the housework.
3. In the United States, lunch _________ (offer) to students for free at school.
4. The first step towards _________ (protect) the environment is to live a "low-carbon" lifestyle.
5. The day all the American basketball fans looked forward to _________ (come) at last.
6. While I _________ (sweep) the floor yesterday, the telephone rang.
7. Jack told me that they _________ to the USA from Shanghai by the end of next November. (return)
8. The disabled mustn't _________ (laugh) at by anybody.
9. The audience are required _________ (show) their tickets when they enter the cinema.
10. They _________ (eat) up all the food, but they still feel hungry.