单项选择题
A tyre（）when you pump air into it．
A.expandsB.contractsC.breaksD.shrinks
单项选择题 I want to（）whom I spend 3 hours each day on the net talking with．
单项选择题 Time should be made good use of（）our lessons well.
单项选择题 She felt very（）when her husband forgot her birthday.
