---I called you yesterday evening, but there was no answer. ----- Oh, I’m sorry. I _____ dinner at a restaurant at that time.
There are lots of _____that students have to follow in school.
Fresh food is good for you . But you have to ______it first because sometimes it a little dirty.
Ther will be less pollution ___more people use public transportation .
Our teacher was very happy because _____failed the examination.
-- Look! Someone ____ the icebox back to the corner. -- Well, it wasn’t me. I didn’t do it. A. has moved B. is moving C. was moving