Scientists are convinced _____the positive effect of laughter _____physical and mental health．
A．of ;at B．by; in C．of ; on D．on ;at
We had wanted to finish our task by noon, but it didn’t quite ______．
A．find out B．give out C．hand out D．work out
____you eat the correct foods _____be able to keep fit and stay healthy．
A．Only if ; will you B．Only if ;you will
C．Unless ; will you D．Unless ; you will
The local government has done everything it can the buried miners．
A．save B．saving C．to save D．be saved
It is difficult for a teacher to give attention to children in a large class．We should reform the situation in order to meet each child’s needs．
A．private B．personal C．individual D．single
_____she forgets to bring a health certificate?
A．What if B．How about C．What for D．So what
