—Hello, is Mr Smith in?
—Sorry, there is no such person _______ you referred to in my office.
| A．that | B．as |
| C．who | D．whom |
He _______ in a university for five years, but now he runs a company of his own.
| A．has taught | B．had taught | C．taught | D．has been teaching |
Since you are here already, you _______ as well stay here and enjoy yourself.
| A．can | B．may | C．should | D．must |
–I tried many times, but I still failed in the experiment.
--Don’t be discouraged. _______ and the problem will be settled.
| A．Having a little effort | B．There is a little effort |
| C．If you have a bit effort | D．A bit more effort |
I try to make him understand that I am not interested in him, but he never gets the ______.
| A．information | B．news | C．word | D．message |
Baird invented _______ television, _______ invention that would later completely change people’s life.
| A．/; the | B．a; / | C．the; an | D．/; an |