—Everybody is going to climb the mountain. Can I go too, mum?—______. Wait till you are old enough, dear.
Well let you use the room ______you keep it clean and tidy .
Is thisthe research center _____you visited thelablast year ?
Don’t believe him .He is just _____ an excuse .
-Would you mind if I take the seat? - .
The bell rang and came in Mr.Brown, a book in his hand. Then the class began.