The train ______ Beijing is going to set off.[ ]

______ do you help the old man with the housework? — Once a week. [ ]

Can you tell me if he ________ ?—-If he _________, I will call you.

Each year __________ fishes are killed by the polluted water and many people are made sick by the polluted air .—-So we should do something to stop it .

How was your day off?—Great！I the history museum.