Shall we go to the“Bird’S Nest”stadium this weekend?—Oh，with all so much homework，I don’t know if I’ll have time to go out．

___ , I have to put the novel away and focus my attention on study this week. [ ]

The rainbow _____ as the sun came fully out from behind the clouds.

123. At present nanotechnology(纳米技术), a kind of tip science_________to the common people. Few people know him.

________ the professor did all he could to help, the experience failed eventually.[ ]