一Everybody is going to climb the mountain. Can I go too, mum? -Wait till you are old enough, dear.
will you?
Why not?
I hope so
I'm afraid not
Once telling him the truth, _____.
Willpower is a kind of quality, _____ is _____ it takes to do anything well.
I was so familiar with him that I recognized his voice _____ I picked up the phone.
It’s reported that the police will soon ____ the case of two missing children.
Tom is keen _____ surfing the Internet in his spare time.