—How do you improve your listening skill, Mary?—I often do it _________ tapes and English radios.
There will be less_______ and the environment will be better. A. trees B. pollution C. factories
Tom ran _______ Sam. They are both winners. A. as quickly as B. as quick as C. so quickly as
—_______ does Mary surf the Internet? — Every day. A. How long B. How many C. How often
Mr. Li is one of _______ best engineers in this factory. A. the B. an C. A
There ______ a soccer game in our school tomorrow afternoon.