1.I will not be able to go to the art exhibit with you tonight because I'm under the weather.
-Under the weather : có chút không khoẻ
2.I may not have my problem solved but at least I know I'm on the right track.
-On the right/wrong track : đi đúng/sai hướng
5.The exam was a piece of cake and I made no mistake.
-A piece of cake : rất dễ
7.He can't come to terms with the fact that he will never race again.
-Come to terms : chấp nhận
9.The cafe was in a mess and we had to do it up.
-Do sth up : sửa, trang trí lại cái gì
10.The last day of the holiday ended in disaster.
-Ended in/with sth : kết thúc trong...