What’s the advantage of shopping online—I think buyers spend a lot of time going to shops.

下列各句中，表达得体的一句是（ ）

In our class there are 46 students, _____half wear glasses.

I’ve become good friends with several of the studentsin my school ______ I met in the English speech contest last year.

You should be ___________ confronting your roommates over any problems, especially if you have just met. Remember, be polite but firm.