The computer is ______useful tool in _______world today.
— Why hasn’t Mr. Li come to work yet? —Because he _______Guangzhou for a holiday.
— I’m a little tired. Let’s go to the zoo by taxi. —We ________take a taxi. It’s not far from here.
— Are we going to have sports meeting this week? — No. It’s ______till next week because of the bad weather.
— Do you know the girl_______ is from Canada?— Yes, her name is Helen.
—Father makes me take much exercise every day.—OK. _______exercise you do, ______ you are.