If you have a problem _____ your composition, you had better ask your teacher ______

It is an unfair thing for our students____ have devoted 12 years to preparing the exam to be beaten by those_____ use illegal methods.

He missed the plane ______ driving veryfast to the airport.

I’m sure Xiaoxiao can ______ a lot of money doing this job and he can ______ a living with the money he earned himself.

He was not really in the mood for anything ______ it dawned on him that it had not been his fault.