Jenny, I can’t go hiking with you __________ I have to help my mum with housework.
| A．so | B．but | C．because | D．unless |
The new treatments________by Norman Bethune helped a number of soldiers．
| A．invent |
| B．invents |
| C．inventing |
| D．invented |
Today，computers are really helpful．They________everywhere．
| A．use |
| B．are used |
| C．used |
| D．were used |
A year has four seasons and it________twelve different star signs．
| A．divided into |
| B．is dividing into |
| C．dividing into |
| D．is divided into |
Battery-operated slippers are used________seeing in the dark．
| A．to |
| B．as |
| C．by |
| D．for |
The children________not to play with fire．
| A．are told |
| B．tell |
| C．asking |
| D．ask |