Don’t worry. I’m sure you’ll succeed _______ if you work hard.
| A．on time | B．in time | C．at times | D．ahead of time |
______ both sides accept these terms will everlasting peace be established in this region.
| A．Unless | B．As long as | C．If only | D．Only if |
I could feel my heart beating violently ______ I went on the stage to sing a song.
| A．for the first time | B．by the time | C．every time | D．from time to time |
Please make sure all the lights are ______ before you go to bed.
| A．turned on | B．turned down | C．switched off | D．switched on |
If you have decided which bike to buy, you can ______ for it on the Internet and we will send it right to your home.
| A．take an order | B．carry out an order | C．keep order | D．place an order |
Studies show that people are more ______ to suffer from back problems if they always sit before computer screens for long hours.
| A．likely | B．possible | C．probable | D．sure |