1 . It’s been a________ to be involved in such an interesting project. (n. something that you are lucky to have the chance to do) （根据英文提示单词拼写）

2 . It seems quite ________ to expect anyone to drive for 3 hours just for a 20-minute meeting. (adj. ridiculous, not reasonable) （根据英文提示单词拼写）

3 . He has been working at the local school for the handicapped on a ________ basis. (adj. done willingly, not because you are forced) （根据英文提示单词拼写）

4 . We also work with other branches to ensure that development. __________ (策略) are followed in an environmentally friendly way. (根据汉语提示单词拼写)

5 . Now tick the solutions that you think are most e ________ (有效) to supply Afica with fresh water. （根据中英文提示填空）