Under the environment of fierce competition, the only way John could imagine _______ stress was to get tougher by making greater efforts.

How can you____ that rude fellow?[ ]

It was ____ the old worker came that we ____ the experiment.

, I have to ______ now It’s time for class—- OK, I’ll call back later

The setting sun was reflected on the river,________ everything along the banks ________ all the more beautiful.