You can’t have finished the book yesterday, _________?。

If he takes on this work, he will have no choice but____an even greater challenge.

Developing science and technology must ____ peoplerather than harm them．

Some poems tell a story or describe something in a way ______ will give the reader a strong impression.

The university estimates that living expenses for international students ________ around $8,450 a year, which ________ a burden for some of them.