Some scientists have sent a spacecraft to Mars. It ____ several months to get there.
| A．spent | B．has spent |
| C．has taken | D．take |
—I am afraid to ask questions because of my poor ______.
—You’d better practice speaking more.
| A．introduction | B．expression |
| C．pronunciation | D．information |
He didn’t wake up ________ he heard the noise.
| A．until | B．while | C．before | D．when |
He wrote books _______ they could learn about how he treated the sick.
| A．not only | B．such that | C．so that | D．in order to |
I think he is one of ___________ players in the world.
| A．good | B．better | C．best | D．the best |
You shouldn’t drive for more than three hours without ______ a rest.
| A．have | B．to have | C．having | D．had |