_______from the moon, our earth, with water _____about 70 percent of its surface, appears like a blue ball.
A. Seen; covered B. Seeing; covering
C. Seen; covering D. Seeing; covered
---Have you got any particular plans for the coming holiday?
---Yes. __________, I’m going to visit some homes for the old in the city.
A. If ever B. If busy C. If so D. If possible
---Have the arrangements for the concert next Saturday been all _______?
---Not yet. We haven’t found a free hand.
A. in store B. in trouble C. in turn D. in place
___________in the mountain for a week, the students were finally saved by the local police .
A. Having lost B. Lost C. Being lost D. Losing
There are some health problems that, when ____ in time, can become bigger ones later on.
A. not treated B. not being treated
C. not to be treated D. not having been treated
It’s only when he reached the tea-house that _____it was the same place he’d been in last year.
A. he realized B. he did realize
C. did he realize D. realized he
