二:语法和词汇知识(共20小题,每小题1分,满分20分)。6._________we must keep in mind is that we must protect water and use it wisely.
A red sky in the morning ______ to be a sign of bad weather.
Hundreds of jobs _______ if the factory closes.
“Look! Everything here is under construction.” “What is the small building that ______for?”
He kept a little notebook, in which ______ the names and addresses of his friends.
“How about the dishes, Dear?” “The beef didn’t taste very good. It ______ too long.”