I like traveling by sea____ it is not rough.
| A．unless | B．in case | C．as long as | D．although |
There are over 58,000 rocky objects in ______ space, about 900 of which could fall down onto ______ earth.
| A．the; the | B．/; the | C．the; a | D．a; / |
Even though they are not doubtful at all _______ John will pass the exam, I still wonder ______ he is fully prepared.
| A．whether; that | B．that; whether | C．that; that | D．whether; whether |
About 10,000 enthusiasts took part in the 2013 Sports Lottery New Year Climbing ________ on Tuesday at the Beijing Badaling section of the Great Wall.
| A．incident | B．accident | C．event | D．affair |
When I graduate from this famous university, I’ll _______ what I have learned to everyday life.
| A．use | B．apply | C．devote | D．stick |
So difficult ________ it to live in an English-speaking country that I determined to learn English.
| A．I have felt | B．have I felt | C．I did feel | D．did I feel |