Hard _____ he tried, he failed to catch up with the first runner.
| A．although | B．as | C．while | D．when |
If the bike is broken again, you'll have to pay to _____ .
| A．get it repaired | B．have it repair | C．have repaired it. | D．get it repair |
A new company _____ here at present. They hope to finish it next month.
| A．will be built | B．is built | C．is being built | D．has been built |
The hottest continent, Africa has a lot of resources, ______ are still undeveloped.
| A．many of them | B．many of whom | C．many of it | D．many of which |
----when are you going off for your holiday?
----My plane ______ at 9:20, so I must be at the airport by 8:20.
| A．took off | B．has taken off |
| C．is taking off | D．would take off |
After the teacher called him into the office, the boy admitted _______ in the test.
| A．to cheat | B．cheated | C．cheat | D．cheating |