很容易的（告诉我为什么选这个选项）

很容易的（告诉我为什么选这个选项）
1.-Why can't my brother go to the bar?
-Because he isn't ______.
A.enough old B.old enough c.enough big d.big enough
2.You can go on a student exchange if you _____ 17 to 17.
A.are aged B.age c.will age D.ages ]
3.-Why were you so upset?
-Because Mary _____ my roses this morning,but she didn't ____ them.
A.received;receive B.received;accept
C.accepted;accept d.accepted;receive
4.-How are you getting on with your study this term?
-I'm trying my best ____ I can catch up with others
A.in case B.in order to C.so that D.so as
5.-What's the aim of your trip to the factory?
-It's ____ about the real lives of the workers there
A.learning B.to learn C.learnt D.learn
6.-What's your sister doing now?
-She,as well as her classmates,___ English together.
A.read B.will read C.is reading D.are reading
7.-Did you use to communicate with your friends by letter?
-Yes.But I ___with them by email since last year.
A.have kept touch B.keep touch C.have kept in touch D.keep in touch