Passive Voice.

София в категроии Английский язык, вопрос открыт 22.03.2018 в 00:15

Fill in blanks using the correct active or passive form of the verbs given in brackets:
1. In recent years, Americans ____________ (to become) more concerned about their health.
2. People also __________ (to take) more interest in good health and nutrition lately.
3. They want _________ (to warn) about the possible dangers of some products.
4. Manufacturers____________ (to make) to put warning labels on certain products.
5. Some foods and drugs that may be dangerous for people’s health ___________ (to take) off the market.
6. Several years ago cancer-causing substances ____________ (to find) in saccharin.
7. Experiments ____________ (to do) on rats but a danger to humans ____________ (not to prove).
8. Nevertheless manufacturers ____________ (to require) to put a warning label on products that contain saccharin.
9. Cancer-causing substances ____________ (to find) in cigarettes.
10. Consumers ____________ (to inform) immediately by radio and TV.
11. Warnings ____________ (to put) on cigarette packages and most Americans very soon ____________ (to react) to that and __________ (to give up) smoking.
12. Many restaurant managers ____________ (to add) nonsmoking sections.
13. Smoking ____________ (to prohibit) on domestic airline flights.
14. In the last decades many useful drugs ____________(to develop) but unfortunately a cure for cancer ____________ (not to find) yet.