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

Bài 1:

1,different

2,for 

3,since 

4,how  often 

5,go 

6,themselves 

Bài 2:

1,to cook 

2,travelling 

3,written 

4,to go 

5,have worked 

6,clean 

7,has not written 

8,go 

Bài 3:

1,He has not seen her for five months 

2,Mrs Lan asked me whether I could carry... 

3,He is as tall as Lan 

4,He is not strong enough to lift a heavy box 

Bài 4:

1,on

2,between 

3,from 

4,between 

5,on

6,between