Scientists are trying to ways to treat the terrible disease called H7N9.

Don’t ______ so often. It’s bad for your health.

Eating and drinking on Beijing subway is not allowed. If youthe rule, you’ll face a fine (罚款) of up to 500 yuan.

Will you get there by ______ train.–No, I will take ______ taxi.

We often go home _____ 4:30 _____the afternoon.[ ]