8. Having made a large number of experiments, (). A. Madame Curries discovered radium B. Madame curries discovering radium C. radium was discovered by Madame Curries D. it was radium that was discovered by Madame Curries ...

4. From the 1960s to the 1970s, what happened in the United States? A. The divorce rate greatly increased and the birthrate fell by half. B. The number of single-parent families rose. C. The number of couples living together without mar...

18. The president exercised a()on the environmental protection bill. A. power B. influence C. strength D. veto ...

10. The manager’s proposal, which met no() in the meeting this morning, will be soon put into action. A. advice B. dissatisfaction C. objection D. evaluation ...

16. The () of natural resources led to their rapid decrease. A. discovery B. consumption C. finding D. study ...

6. In the morning, people take different()to go to work. A. vehicles B. steps C. feet D. hands ...

8. The change with North American diet is (). A. more water B. fewer eggs C. more chicken and fish D. less red meat ...

18. Usually in the summer, governments at all levels become quite alert about()because of the hot and dry weather. A. drought B. flood C. hurricane D. storm ...

11. The mental()has changed him from a talent to a moron. A. disruption B. state C. disorder D. health ...

1. Be careful while crossing the street. Don't forget () over by a bike the other day. A. to knock B. to be knocked C. being knocked D. to have knocked ...