When Steven suddenly remembered that he had left his mobile in the office, the train was already________.[ ]

17The movie is to deucate people about environmental problems ______our planet

We _____to Sydney next MondayWhat about having a party this weekend?

, Jane has many advantages, too——Oh, yes _______ others are weak, she is strong

_ Whatin ____ world do you like most in _____ world_ Ihope _____ world is _____peaceful and fair world