E-mail is very popular today. People hardly post letters, _________?
Tom often _____ TV on Saturday evenings, but now he _____ stories.
—_____ do you like science?—Because it’s interesting.
—You must _____ a letter to your mother tomorrow.—Well, I will, Dad.
—_____ does Kangkang meet his friends?—Four times a month.
Mr. Wang _____ gets up early. So he is ______ late for work.