Some aspects of a pilot’s job _______ be boring,and pilots often _______ work at inconvenient hours.
| A．can; have to | B．may; have to |
| C．have to; may | D．ought to; must |
You made the same mistake second time, dropping “n” in the word “running”.
| A．a, the | B．a , a | C．a, an | D．the, an |
—I’m afraid I can’t finish the book within this week.
—__________.
| A．Please go ahead | B．That’s right | C．Not at all | D．Take your time |
The hunter insisted that he _____ a tiger and that a searching team ______ to hunt for it.
| A．has seen; be set up | B．had seen; be set up |
| C．saw; would be set up | D．should see; should be set up |
You have to keep on learning if you want to keep ______ with the development of modern science and technology.
| A．peace | B．touch | C．pace | D．connect |
The athlete fell off his bike when he _____ down the hill.
| A．cycled | B．was cycling | C．had cycled | D．is cycling |