Choose the correct form of the verbs in brackets. 1. There (is, are, were) many economic problems in the world.
2. Our foreign trade (had expanded, have expanded, has expanded) during recent years.
3. Economics as (the, a) science (consisted, consists, consist) of two disciplines.
4. How much income tax (did he pay, have he paid, he paid) last year?
5. Most students usually work (more hard, more harder, harder) before the exams.
6. The manager (had, has, have) already signed the letter.
7. This firm (is carrying on, carry on) negotiations for the purchase of ore.
8. We (were allowed, could) to use dictionaries when we translated the article.
9. When they find a suitable wholesaler, they (shall, would, will) open a few shops.
10. Not long ago I (attend, attended) a lecture on economics, where I (heared, heard) a lot of interesting things about the economy of Ukraine.