------Tony, are you listening to me ？
------Sorry sir, I to understand what you said just now.
| A．try | B．was trying | C．tried | D．have tried |
_______ he lives in a rich family, he started from the lowest position as an ordinary worker to make his living.
| A．While | B．Unless | C．As | D．Since |
The big company should be ready to ______ many talents who can often _____ a new idea for increasing sales.
| A．take in; come across | B．take on; come on |
| C．take on; come up with | D．take in; come up with |
Because of the bad management, this restaurant was not _______ it was 10 years ago.
| A．half as good as what | B．as half good as that |
| C．as good as half what | D．half as good as that |
We can never expect ______ bluer sky unless we stop ______ industrial waste going into _____ atmosphere.
| A．a; the; the | B．the; the; the | C．a; /; the | D．the; /; / |
________that he made an obvious mistake，Jeff went on with his speech.
| A．Not realized | B．Not realizing |
| C．Not to realize | D．Not to have realized |