—Who is the baby in this photo?—It’s my sister’s son. The photo _____ by her by e-mail ten days ago.
It is getting warmer and warmer. You ________ wear so many clothes.
—Where are your children? —I had no idea. But when I left home this morning, I saw them _______ a football in the yard.
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