1、It is a difficult problem .Tom _____ cannot work it out.

1、It is a difficult problem .Tom _____ cannot work it out.
A.only B.alone C.lonely D.along
2、We planted a lot of trees.Our house is _____ the trees.
A.between B.among C.with D.in
3、Do you know_______?
A.a girl in brown B.the girl with glasses C.a girl with blue D.the girl in a pair of glasses
4、 Only Smith knew the answer.(保持原句意思）
Smith _____ knew the answer.
5、He became a dentist in 2000 （同上）
He has ______ _____ a dentist ____ about five years.