Must I clean up the classroom right now, Miss Green?– No, you ______.

______ he______ at this school last term?－Yes, I think so.

Dad,could you buy me a MP4 like this? — Sure, we can buy ____ one than this, but ____this. [ ]

What a great artist! It seemed only a couple of minutes ____ he had finished this wonderful painting!

Eating much vegetables is good __________ your health.[ ]