Can I go to the park, Mum?—Certainly. But you ______ be back by six o’clock.

John is in a bad mood these days. Do you know why?—His grandfather has just passed away. Let’s try to _______.

Miss Gao isn’t at home. She to the station to meet her friends.

Is your father a doctor in No.2 Hospital?—No, he ___________ a farmer and now he is a driver.

My school is _____ the end of the second road.[ ]