You will be late ______ you hurry up.
Mrs. White _____ her wallet now, but she can’t ______ it.
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.