— I can’t decide __________or not I should encourage my son to be a volunteer.
— Why not? It will make him more helpful.
| A．if | B．whether |
| C．how | D．why |
—Listen！Who________the piano？
—My sister．
| A．is playing |
| B．plays |
| C．played |
| D．play |
To be a policeman is interesting________sometimes it’s kind of dangerous．
| A．and |
| B．or |
| C．but |
| D．so |
—I’ve shown you all the interesting and important places of our school．
—Thank you for________so much time．
| A．taking |
| B．spending |
| C．costing |
| D．having |
________energy，turn off the hot water after you take a shower．
| A．Save |
| B．Saving |
| C．Saved |
| D．To save |
—Did they clean the house yesterday？
—________，They cleaned at five o’clock．
| A．No，they didn’t |
| B．Yes，they did |
| C．No，they don’t |
| D．Yes，they do |