--It’s clever _____ you to help me work out this difficult maths problem. Thanks.--- You are welcome. Now it’s easier ______ you to understand it.
Why don’t you ________? A.write down it B.write down C.write it down
I ________ the living room.Look,it is clean. A.clean B.am cleaning C.have cleaned
The children ________ at the table when their mother cooked in the kitchen. A.wait B.are waiting C.were waiting
--How many times has Chang’eⅠ ________ the Moon? --Only once.It went there last year. A.go to B.gone to C.been to
We have learned English ________ six years. A.since B.for C.on