The number of tigers in Asia________ getting smaller and smaller and a large number of people_________ trying to protect them．

(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.

There is _____　a pen, an eraser and some pencils in her pencil-box.

 ---Have you heard that Tom, as well as his parents, ________ moved to Beijing ? ---Really ? No _________ I haven’t seen him for a long time.

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