our article is too long. You must _______ to about 3000 words.

It is helpful for children to form a good habit by asking them to _____ all the toys after they finish playing.

The conference has been held to discuss the effects of tourism ________ the wildlife in the area.

To those scientists, it still remains to be a question ______ man can go back to the old days with time machine

What do you think of the questions in today’s test .– Not very easy . I think it’s really hard to find the answers __________ the questions .