1£®It is requested that every student (should)_write(write) a paper on sustainable development.

2£®I know you are tired after a long walk£¬but try to hang on a bit longer.

3£®It is obvious that this destruction will become more dangerous in the future.

4£®If I were (be) you£¬I would go swimming with Lucy.

5£®The organization encourages members to meet on a regular basis£¬as well as providing (provide) them with financial support.