The air is deadly polluted because some factories don't ________ the rules to protect the environment.
A. appreciate B. regard
C. honor D. respect
The visiting minister expressed his satisfaction with the talks, ______ that he had enjoyed his stay here.
A. having added B. to add
C. adding D. added
You should try not to get ________ in the trouble between them.
A. lost B. involved
C. absorbed D. trapped
Many countries are in great need of natural gas, wind and other forms of ________.
A. power B. source C. energy D. material
Good heavens! There you are! We were all ________ about your safety. We were expecting you to come back much earlier all through the night.
A. curious B. concerned
C. upset D. interested
________you eat the correct foods ________ be able to keep fit and stay healthy.
A. Only if; will you B. Only if; you will
C. Unless; will you D. Unless; you will
