—___________ did you see in the picture?—Nothing.
—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 is a little dirty.
There will be less pollution ___more people use public transportation .
Our teacher was very happy because _____failed the examination.