We ____ the task by the time he came to help us.[ ]

What do you think of the film called So Young— I think this is the most wonderful film _______ I have ever seen.

______in bed is______ for our eye .

Every possible means _______ to prevent the air pollution, but the sky is still not clear.[ ]

a very hard-working student —________ As far as I know, he often burns themidnight oil