单项选择题
A.back B.up C.off D.down
We failed in our（）to climb the mountain.A.trialB.contem...
单项选择题We failed in our（）to climb the mountain.
A.trial B.contempt C.desire D.attempt
If you want to learn something, you had better pay（）in ...
单项选择题If you want to learn something, you had better pay（）in class.
A.care B.respect C.attention D.notion
In addition to rice, we need to（）our diet with fish, me...
单项选择题In addition to rice, we need to（）our diet with fish, meat and vegetable.
A.supplement B.replace C.add D.eat
