Neither the students nor their teacher _______ the solution to the problem.
–Tom, you didn’t come to my party last night?– I ________, but my mom hurt her back and I had to look after her.
Their school looks quite different from _______ ten years ago.
We must try our best to stop pollution ______ a low-carbon(低碳)life.
–I think honesty is the most important thing in doing everything.–__________ .
Four hundred dollars for just a pair of shoes? You ______ be joking!