He works very hard______present. However, he used to pay no attention_____his lessons.

  A.at,to           B.to,to           C.to,at         D .at,at

He works very hard. Every night he doesn't go to bed ________ eleven o'clock.

A. after

B. until

C. since

D. in

He works very hard every day ________ pass the final exam.

A. in order

B. in order to

C. in order that

D. in orders

He works very hard ______ physics, still he can't keep ______ his classmates.

[    ]

A. on, up to　　    B. for, on with

C. with, down in    D. at, up with