Have you ever been back to our primary school?—Yes,I go to see Mr Wang______.[ ]

There will be lecture (演讲) in half an hour.The meeting room with people.

Why are you so _______,Amy?—I thought I lost my purse, but I didn’t. I found it in my study!

Some people waste too much water. They don’t believe that it can__________some day.

_____chapter in Oxford English often consists of four parts．—That’s right．And this chapter mainly talks about _____environmental problems．