Vitamin D helps our bodies make a special chemical，and this special chemical，________，affects our brains，making us feel happy.
| A．in turn | B．in particular |
| C．in advance | D．in short |
. I still remember _______to the Great Wall and what I saw there.
| A．To take | B．to be taken | C．taking | D．being taken |
-----Why don’t we choose that road to save time?
----The bridge to it ________.
| A．has repaired | B．is repaired |
| C．is being repaired | D．will be repaired |
. In our childhood, we were often _____ by Grandma to pay attention to our table manners.
| A．demanded | B．reminded | C．allowed | D．hoped |
The teacher demanded that the homework ________in the way we’d just learned.
| A．is done | B．has been done | C．be done | D．was done |
In order to improve English, __________.
| A．it is necessary to need a lot of practice. |
| B．a lot of practice is needed. |
| C．you need a lot of practice |
| D．it needs a lot of practice. |