41.Go/keep on a diet

　　I’m on a diet recently， so I’d better skip the dessert.

　　42.Have a hard/difficult time with sth.

　　43.Have a temperature/fever

　　44.Have the final say：有决定权

　　45.Hold up：堵塞i，持枪拦截，举起，拦截

　　Did you hear that the convenience store next to the gas station was held up last night?(2005-6)

　　46.In a good/terribly /mood

　　47.In the long run：长期来看

　　It seems very experience. But in the long run it will save the money on the maintenance.(1995-6)

　　48.Join in：参与

　　49.Keep between the two of us:/keep a secret

　　50.Keep fit