1. for / of

2. without

3. of 

4. in / in 

5. to

6. by/ by 

1 . Nick used to go to the library from time to time to look ...for... articles ..of.. the subject he was very fond ......

2 . This job would be impossible ....without.. the help of a computer

3 . At first , my English homework was full ..of.. mistakes .

4 . Please write ...by... ink , It is hard to read if you write ..by... pencil

5 . If you have a problem , talk ..to. the teacher

6 . Going there ..by... taxi is more expensive than travelling .by.. the bus

Chúc bạn học tốt!