— He is a very hard-working student.— .As far as I know, he often burns the midnight oil.
I can’t find my watch. I must have ________it in the hotel.
Is Mr. Wang good at drawing his students into ________ discussion?
_________side of the street is lied with different shops, _________of which sell electronic products.
Only when _____ possible to settle the problem.
They stayed with me three weeks, _____ they drank all the wine I had.