niversity estimates that living expenses for international students ________ around $8，450 a year, which ________ a burden for some of them.

Middle school students hardly know anything aboutshopping online, ____ they? — ________. It’s very popular withteenagers.

There is _______big desk in our classroom. _______desk is for our teacher.

With the help of the new equipment, our factory produced _____ VCD players in 2009 as the year before [ ]

Are there any maps in your classroom— ________. There are two maps in it.