Look, what have they done? —Sorry. I think if I __________ another chance, I’ll do it better.

____ I swim here?—I’m sorry. Children ____ swim alone here..

Is this your earser?—No,it isn’t. It’s ________.

Would your parents like to go to Taiwan for a vacation with you? —They’d love to, but ______of them has enough time .

What color is the schoolbag?－It’s .