1 Write the correct form of the verb in brackets.
1) If we buy a car, we (not have to) travel by train.
2) If you go to a party, I'm sure you (have) a good time.
3) When you (run) fast, you get tired.
4) I'll wash the dishes if you (cook) dinner.
5) I take my umbrella whenever it (rain).
6) If you (not study), you may fall the test.
7) If she (not sleep) enough, she (get) tired.
8) I (invite) all my friends if I have a party.
9) I (buy) you a present if I have enough money.
10) Cars (not pollute) the air if people Ответ (invent) new fuel.