---Lucy, is maths difficult to learn in a foreign school?
---I’m not sure, but no subject can be learned well __________hard work.
| A．without | B．through | C．by | D．with |
Our team tried our best, ________ we failed the match at last.
| A．but | B．and | C．or | D．while |
Mr. Li will go to Guangzhou by air. His workmates are ______ at the airport.
| A．turning him off | B．seeing him off | C．taking him off | D．putting him off |
The computerin 1946 in America.
| A．is invented | B．was invented | C．invents | D．invented |
—Why are you so happy today?
—Because I to London with my parents tomorrow.
| A．fly | B．am flying | C．have flown | D．flew |
The policeman told us __________ the street when the traffic light was red.
| A．not cross | B．didn’t cross | C．not crossing | D．not to cross |