1 . 用所给词组的正确形式填空

look forward to     concentrate on   be anxious about       next to     out of curiosity make a good impression on       what if     be junior to        leave…alone…     add...to...

1. __________ the boy opened the box, only to find nothing in it.
2. That guy has become annoyed, __________ him ________.
3. I'm familiar with his work and __________ reading more of his works.
4. She turned down the invitation to his birthday party in order to __________ her studies.
5. __________ the teacher finds out that you haven't finished your homework?
6. Helen __________ her son travelling on his own.
7. Proper clothes will help you __________ others.
8. He __________ me, though he is older.
9. I got a place __________ the window, so I had a good view of the sidewalk.
10. Would you like to __________ some sugar __________ the coffee?