You’d better ________ right after supper.

---Why not wear your miniskirt, Rose? --- Well, my legs are too thick, if you ______ know.

–Why don’t you stay at the Baotuquan Hotel?  --You      ! Do you know how expensive that place is?       

 I told Sally how to get here, but perhaps I ______for her.

--- 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?