______ he met with the difficulty did he realize the importance of our help.
| A．Even after | B．Never until | C．Only before | D．Ever though |
______ make her father angry, Joan didn’t tell him her poor grade.
| A．In order to not | B．So that |
| C．So as not to | D．In order not to |
Samuel Clemens，______ Mark Twain, wrote many popular stories.
| A．was known as | B．known as |
| C．was known for | D．known for |
The old man used _____ in front of his house and he has got used to _______ like that.
| A．to sit; doing | B．to sitting; do |
| C．to sit; do | D．to sitting; doing |
Mr. Brown, ______ chairman of the trade union, will visit our factory in _____ month of May.
| A．/; the | B．a; the | C．the; / | D．the; the |
He has called several times this morning, ____ there is something very urgent.
| A．really | B．especially | C．obviously | D．terribly |