The astronauts were so struck by ______beauty of nature that they took lots of pictures in _______space. 
21.
| A．the ; / | B．the; the | C．/; the | D．/;/ |
It was only after I came across that matter_______ how important it was to master a foreign language.
| A．did I realize | B．had I realized |
| C．that I realized | D．when I realized |
--- When shall we meet again, Tom?
--- Make ______ day you like; it’s all the same to me.
| A．that one | B．it any | C．it another | D．that some |
Every athlete as well as some coaches who ____ to go to the Games ____ asked to be here before 7:30 am.
| A．are; are | B．is; is | C．are; is | D．is; are |
His parents both died in the traffic accidents, ________ him a lot of debts.
| A．having left | B．left | C．to leave | D．leaving |
--- I’m not good at singing, you know.
--- ________! It’s just for fun.
| A．No problem | B．Come on | C．What a pity | D．Cheer up |