—Everybody is going to climb the mountain . Can I go too , mom ?— ______ Wait till you are old enough ,dear.
The old city wall ______ in the Ming Dynasty.
The doctors have done ______ they could ______the child.
The teacher asked the students ______ .
I don’t know where I ______ my dictionary, which cost me 50 yuan.
If you are traveling___ the customs are really foreign to your own, please do as the Romans do.