(2013·高考湖南卷)The university estimates that living expenses for international students________around $8,450 a year，which________a burden for some of them.

My trousers       being washed.What’s worse，this pair of trousers bought yesterday       too short for me.

---___________ everyone present at the meeting?      ---No, all but one _________ there.

–Where _______ the socks?   --_______ on the bed.

Nowadays signs prohibiting smoking       a common sight in restaurants, tea houses and shopping malls．