The old woman seldom leaves her house,______?A. isn’t she B. does she C. doesn’t she
My shoes are worn out.They need_______.
He hadn’t worked hard at his lessons._______, he failed in the exam.
— When did the meeting begin? —At four o’clock.It ______ for 15 minutes.
It is said that the gravity on Mars is only about __________ of the gravity on earth.
After a short time, the bad news had ______all over the city and everybody knew it.