It’s said that __________ is going to giveus a lecture.

edtogethomebeforedark,butitdidn’tquite________asplanned

The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?–________ my students have a try?

_____ Mom had asked Jack to close thewindow before he went out,______ he forgot to do it.

Here comes the train. Let’s_____.