A: Can I use your dictionary? B: _____________.
—Ben and Sue aren’t home,are they?—No.They _____to London on business.
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.