22、Who ealled  me this morning when I was not?

----A man ealling______Robert.
A.his              B.himself              C.his               D.不填

21、Look out! Don’t get too close to the house______roof is under repair.
A.whose            B.which            C.of which            D.what

20、Sorry. Madam. You’d better come tomorrow because it’s______the visiting hours.
A.during             B.at              C.beyond              D.before

19、I adies and gendemen, please fasten your seat belts. The plane________.
A.takes off              B.is taking off            

C.has taken off           D.took off

18、----How long do you think it will be______China sends a meanned spaceship to the moon?
-----Perhaps two or three years.
A.when               B.until             C.that               D.before

17、Green products are becoming more and more popular because they are environmentally_______.
A.friendly           B.various           C.common        D.changeable

16、If it were not for the fact that she______sing, I would invite ber to the party.
A.couldn’t          B.shouldn’t          C.can’t            D.might not

15、I’m sure you’d tather she went to school by bus,_______?
A.hadn’t you         B.wouldn’t you         C.aren’t         D.didn’t she