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.
Ⅱ.单句改错
1．What was obvious that the manager of the coffee shop was waiting for Li Fang to leave.What→It
2．Now that you've got a chance，you might as well to make full use of it.去掉to
3．Mary as well as I have been to the Great Wall.have→has
4．Wherever you go，keep touch with me，please.keep后加in
5．Brown meat essence is harmful for people's health.for→to
