We really shouldn’t use plastic bags any more when shopping.—_____ It’s important to protect our environment.

It was only a very short time _______ the young ladyfound her cellphone stolen as she got on the crowed bus.

I can’t see the words on the blackboard clearly.-___ can I. Maybe we should wear glasses.

The air in Beijing is getting much ______ now than a few years ago.

What ______ me most was not what he told mebut why he looked at me in _______ all the time.