This is one of the experiments __________ in our laboratory.
The difficulty we now meet with is ___________ we can persuade him to tell the truth.
It was really very dangerous; you ____ him seriously if I didn’t stop you.
—What do you think of the hotel here? —Oh, wonderful! We ____ a better one than this.
We are all looking forward ______ the Great Wall during the National Day.
_________ production up by 60%, the company has had another excellent year.