Instructions for homework have to be ______ so that every student knows clearly what is to do after class.
It’s helpful to put children in a situation _____ they can see themselves differently.
Only when he reached the tea-house ______it was the same place he’d been in last year.
___ they visited our school, they showed great interest in everything they saw.
It_____everyone to hear all of the villagers behind the mountain were killed in the earthquake.
— large number of trees have been stolen from the forest,haven’t they?—Yes. number of them is 26,000.