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 .

It’s good for you to _______ in class.— I think so. Thank you.

The dish looked bad, but it_______ OK. — So it’s not right to judge a man by his appearance.

How long has Lisa had the flu? —______ last Friday. [ ]

When you want to save a new document, you must write a name ______ it. [ ]