They ____ all over the country, so they plan ____ some other countries.
| A．have traveled, visit | B．traveled, to visit |
| C．have traveled, to visit | D．traveled, visit |
About _______ of the workers in the factory were born in the ______.
| A．two thirds; 1970 | B．two thirds; 1970s |
| C．two third; 1970 | D．two third; 1970s |
You can’t believe how terrible the fire is _______ you see it with your own eyes.
| A．though | B．because | C．unless | D．since |
Driving in rush hour traffic ______ be very dangerous, so you _____ be too careless.
| A．should; ought to | B．could; should |
| C．might; mustn’t | D．can; can’t |
Jerry is always so busy that he can hardly _________ a few minutes to talk with his child.
| A．spare | B．share | C．spend | D．save |
---________ it is from our own planet Earth to Mars!
--- Yes, it takes months to travel to Mars by spacecraft.
| A．How soon | B．How far |
| C．How long | D．How often |