— Must I turn off the gas after cooking?— Of course. You can never be________ careful with that.
Don’t ________ until the bus stops. Or it’s too dangerous.
Mr. Smith was ill ________. He had to have three weeks ________.
The number of students in our school ________ 2000 and a number of them ________ good at playing basketball. A. is, is B are, are C. is, are D. are, is
—I’m sorry. I ________my exercise book at home. —Don’t forget ________ it here tomorrow, please.
—What’s he like? —________.