Listen! There must be someone _________ through the jungle. A. trek B. treking C. trekking
--- Could you tell me the way ______ the railway station? --- Go along this road and soon you’ll find it.
The novel ______ by many people today.
--- Is that man Mr. Smith? --- It ______ be him. He has gone to NewYork on business.
Meimei thinks maths is ______ than Chinese.
In 1998, Liu Xiang’s ______ in hurdling was noticed by Sun Jiangping.