Waste paper mustn’t _______. We should keep our environment clean.

Should people stop using their cars and start using public transport?— __________ The roads are too crowded as it is

When is he willing to lend his friends some money— Only when ______ hard enough.

ring thenews, the girl rushed out without hesitation, ______ the luggage ______ on thefloor, and ______ in the dark

I want to give up English. It’s too difficult-Come on. We know we won’t make it hard work.