This is the best book _____ I have beenlooking for all this year.

Lei Yang can’t help _______________ the room because he is busy with his work.

I told you that he would go abroad for further study.—Actually I had little doubt_____ it was true

It is reported that the police will soon ________ the case of the two missing children.[ ]

He has _______good knowledge of_____English language but not much of English history.