1. _________ air is one of the many problems we have to solve
2. I’ll be in trouble if I _________my passport
3. If it is raining this evening, I_________.
4. We couldn’t go on a picnic as planned __________ it was raining
5. If he ________ hard today, can he have a holiday tomorrow?
6. Because there _________ no buses, we had to take a taxi
7. We plan to ________ this Saturday.
8. I’ll have to buy a map _________ I don’t know this area.
9. If you know where she lives, please let me__________
10. Life today is very different ______ life 50 years ago.
11. My uncle is a ______. He often does research in his laboratory.
12. My father arrives in Singapore ______Monday evening.
13. I hope the weather will be nice ______ the weekend.
14. Would you like ______ to a party on Saturday?
15. Helen is always in the kitchen. She enjoys ______.
16. Vietnamese women prefer to wear modern clothing ______ work
17. He ______ with friends in an apartment in HCMC since last week.
18. My mother said she ______ busy then