My name is Robert， most of my friends call me Bob for short．
| A．then | B．instead | C．however | D．but |
----I’m sorry, but making a telephone call is not allowed in the meeting-room.
----Oh, I_____that, Sorry, I don’t do that again.
| A．don’t know | B．didn’t know | C．won’t know | D．haven’t known |
One reason why_____plane is such a popular means of_____transport is that it is very fast and safe.
| A．the; / | B．a; the | C．a;/ | D．the; the |
Would you please put the dictionary ____ it belongs ?
| A．to whom | B．to which | C．where | D．that |
___ I have often heard this song, I have never heard you sing it.
| A．In case | B．Though | C．Even | D．In spite of |
I wouldn't manage to do it___ you had explained how.
| A．unless | B．until | C．when | D．since |