---Whose purse is it? ---If it isn’t yours, it must be _________.
--- She’s already been back to Wuxi, ________? --- ________. She is on a visit to Shanghai.
Mary _____ up yet because she _____ to bed very late last night.
--- Would you like to go birdwatching with us? --- .
He will work in this school _______.
The number of the red-crowned cranes will become ____ if we don’t take any action.