1. What .......... they do yesterday?
2. What .......... they do tomorrow?
3. Kate and George .......... good friends.
4. My birthday is .......... December.
5. Does your sister .......... eating apples?
6. Sarah .......... have a glass of wine tonight. She is taking antibiotics.
7. We have regular .......... who do their weekly shopping at our store.
8. In case of .......... break the glass and press the button.
9. When my father arrived home, I .......... in my room.
10. You should spend enough time .......... you speak English fluently.
11. During last weekend, the weather was .......... hot .......... we couldn’t go out for hiking.
12. Fortunately, a tornado does not .......... long, about 20 to 30 minutes on the average.
13. When fossil fuels are burned, they .......... poisonous gases which are carried up into the atmosphere.
14. The natural environment .......... all natural resources that are necessary for life.
15. Volkan is a very diligent student and never misses the English class. But today he didn’t attend the morning class. He .......... an important problem.
16. If my parents ……………………… a farm around the beach area when they moved this city many years ago, we ……………………… very rich now.
17. When China’s economic growth CO2 emissions began skyrocketing in 2003, ...........
18. When I first started on this journey of changing the way I teach, I did not know where my path would ultimately lead.
19. The ice sheet, consisting of layers of compressed snow from more than 100,000 years, contains in its ice today's most valuable record of past climates.
20. Bacteria are minute, single-celled organisms of variable shape and activity. Along with the viruses, they are classified as the lowest forms of plant life. Bacteria are everywhere - in soil, water, dust and in air. .............. . Some turn decaying vegetable matter into manure; others within the human or animal body, assist in the development of certain vitamins essential to health.