1/
1.different
2.for
3.since
4.how long
5.go
6.themselves
2/
1.to cook
2.traveling
3.written
4.to go
5.have worked
6.clean
7.hasn't written
8.go
3/
1.He has not seen her for five months
2.Mrs.Lan asked me if i could carry those chairs into the house
3.He is as tall as Lan
4.He is not strong enough to lift a heavy box
4/
1.on
2.between
3.from
4.between
5.on
6.in