—Excuse me,could you tell me________a book about science?—Sure.They are on the second floor.
_____healthy,you should take more exercise and eat more healthily . A.Keep B.To keep C.Keepng
Is your father a worker ? No,but he ______. A.used to do B.used to be C.is used to be
Then machine doesn’t work .I think it needs _____. A. to mend B. mended C.mending
Hi,Andy.I haven’t seenyou for a long time Where______? A.have you gone to B.have you been to C.have you been
Travelling to the moon_______several days,and the trip ___too much money A.costs,costs B.takes,costs C. spends,pays