No one but the experts in this field can _____ the difference between them.
| A．recognize | B．speak | C．spot | D．predict |
I developed very slowly and it took nearly two hundred years I was built as an analytical machine by Charles Babbage.
| A．before | B．after | C．long | D．short |
_____ the boy is determined to do something , no one can stop him.
| A．Even if | B．Now that | C．Once | D．However |
Don’t ________ women. They are as important as men for the development of society.
| A．look at | B．look down upon |
| C．look out for | D．look forward to |
Only after the woman had her own child ________ how difficult it was to be a mother.
| A．she realized | B．had she realized |
| C．she had realized | D．did she realize |
Mary, together with his classmates, _____ going to watch the game.
| A．is | B．are | C．will be | D．will |