I won’t call you, ________ something unexpected happens.
| A．unless | B．whether | C．because | D．while |
The first two services are free，______the third costs￡35.
| A．while | B．whether | C．what | D．which |
You can’t have this football back _________you promise not to kick at my cat again.
| A．because | B．until | C．when | D．since |
Sarah，hurry up，I’m afraid you don’t have time to__________.
| A．get change | B．get changing |
| C．get to change | D．get changed |
—I am so angry that I could blow my top!
—Oh, dear, _______． What’s wrong?
| A．no hurry | B．no wonder | C．take it easy | D．take your time |
Some scientists believe that it won’t be long _______ robots are widely used in all walks of life．
| A．since | B．after | C．before | D．until |