How can you expect him to make any progress _____ you never give him a chance to have a try?
| A．when | B．unless | C．even though | D．until |
Jack, I’m afraid I’ll turn to you．I think chemistry is _______ physics．
| A．as a difficult subject as | B．a subject the same difficult as |
| C．as difficult a subject as | D．the same difficult subject as |
Not until then did I find it _____ to do the job that way.
| A．is easier | B．easier | C．was more easily | D．more easily |
Most of the professors _____ to our school were from South Africa．
| A．invited | B．to be invited | C．being invited | D．had been invited |
You may takehalf of the cake; they’re exactly the same.
| A．both | B．either | C．any | D．each |
by the growing interest in nature, more and more people enjoy outdoor sports.
| A．Influenced | B．Influencing | C．Having influenced | D．To be influenced |