﹣Jack fell down and hurt himself yesterday．
﹣_______．（ ）
| A． |
No problem |
| B． |
Nothing serious |
| C． |
It doesn't matter |
| D． |
I'm sorry to hear that |
Li Hua's parents hold different opinions on whether they should have _______ child．（ ）
A．anotherB．otherC．othersD．the other
Milk quickly goes bad _______ it is put into the fridge．（ ）
A．ifB．unlessC．whetherD．until
Father _______ goes to the gym with me although he dislikes going there．（ ）
A．neverB．hardlyC．seldomD．sometimes
New media， like WeChat， _______ the way of communications nowadays．（ ）
A．are changingB．will change
C．changedD．were changing
If you want to be on the school football team， you _______ train harder．（ ）
A．canB．willC．mayD．must