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?

People will get annoyed if someone ______ in line.

I don’t ______ his words, because he often tells lies.

Are you a member of the club?— It’s years since I

We wonder if our teachers to our graduating party next weekend. If they , we’ll be very happy.