You can only be sure of __________ you have at present; you cannot be sure of something __________ you might get in the future.

If prices rise too high, the government has to dosomething __________ it.

How about your trip to Hainan?—-It couldn’t have been _____. Sometimes I went swimming in the sea; sometimes I lay on the sand.

Sara, hurry up.I’m afraid you won’t have time to ________ before the party.

I like getting up very early in summer. The morning air is so good__________. [ ]