I make most of my money by writing books but I do __________ magazines sometimes.
| A．refer to | B．see to | C．contribute to | D．add to |
Man _____ profit, sometimes even being unaware of the harm he has done to the environment.
| A．is always pursuing | B．was always pursuing |
| C．had always pursued | D．had always been pursuing |
I’m glad to see that you _____ a lot of progress since I _____ you last.
| A．will make; have met | B．have been making; met |
| C．had made; met | D．have made; meeting |
More than one teacher _____ told him it is important that he learn English well if he _____ aboard.
| A．have; shall go | B．has; want to go | C．has; wants to go | D．had; will go |
The meeting was _____ at ten o’clock, but the chairman hadn’t turned up by eleven o’clock.
| A．start | B．have started | C．be starting | D．be started |
The last half of the nineteenth century _____ the steady improvement in the meansof travel.
| A．has witnessed | B．was witnessed | C．witnessed | D．is witnessed |