One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.
| A．commitment | B．attention | C．reference | D．reaction |
Parents should encourage their children to __________ in all kinds of activities to train their ability of teamwork.
| A．participate |
| B．donate |
| C．devote |
| D．witness |
At last9 nothing but some trees remains，with some branches __________ the wall.
| A．stick out of |
| B．stuck out of |
| C．sticking out of |
| D．to stick out of |
“I __________ to meet you at the office，but I didn't see you，” the student said to the teacher.
| A．did come |
| B．did came |
| C．has come |
| D．had come |
__________，his suggestion is not helpful, though it sounds very interesting.
| A．Generally speaking |
| B．On the contrary |
| C．In particular |
| D．To be honest |
Who did you __________ to pick up the foreigner at the airport?
| A．arrange |
| B．arranged for |
| C．arrange for |
| D．arranged |