____ several times, the young scientist still kept ondoing his experiments.

He hesitated for a moment before kicking the ball, otherwise, he _____ a goal. [ ]

Is there ________in the room—-No，there’s________there.

That clothes store is _____ on weekends. –I see. I’ll go there next Monday then.

You can get the best result ________ youcarry out the experiment under the desired conditions