1.用适当介词填空
When I saw my grandfather ___off___ ___at___ the airport,he told me that he had given __up___ smoking.
（注：off和up在这儿都是副词,不知是否符合你们的要求.）
2.改变句型
Is your father in?=== Is your father ___at__ __home__?
3.选择
He works hard at school and his teachers often praise him __D__ his hard work.
A.with B.at C.on D.for
I was angry and threw a stone __C__ him.
A.to B.towards C.at D.for
Would you show me __D__ your factory?
A.to B.in C.at D.round
Don't catch me __A_ the arm.I have nothing to do ____ the matter.
A.by/with B.on/with C.by/on D.on/on
Li fell ___C_ his bicycle this morning.
A.on B.down C.off D.to
He has made friends __A____ many Chinese students.
A.with B.to C.by D.among
I often learn singing and dancing __D__ hobbies.
A./ B.on C.in D.fo