－Why does the river smell terrible? －Because the water_______.
| A．was polluted | B．has been polluted | C．will be polluted | D．has polluted |
You can eat these two ______ kinds of food, and find the ______ between them.
| A．different, different | B．different, differences |
| C．difference, difference | D．differences, different |
Lily ______ goes to the movies. She thinks they are too boring.
| A．always | B．hardly | C．sometimes | D．usually |
I like junk food so much because ______ really delicious.
| A．it | B．it’s | C．they | D．they’re |
If you have a headache, you must take some ______.
| A．exercise | B．showers | C．medicines | D．medicine |
---______ do you exercise?
---Once a week.
| A．How long | B．How often | C．How many | D．How old |