----How many foreign workers are there in your company?----There are five, three _______ and two _______.
These photos _______ by my sister on Mount Tai last summer.
—May I play computer games, Mum?—No, you ______. You’ve got a lot of homework to do.
Mike and I _______ net-friends. We talk on-line every week.
—Which car is _______, the yellow one or the red one? —The red one, I think.
— _______ does Earth Day come every year? —It comes on April 22.