Measures have been taken to prevent accidents, but much ______ for more improvement.
| A．remains to be done | B．is remained to do |
| C．remains to do | D．is remained to be done |
Not only his parents but also his brother ________ to the Summer Palace. They haven't
been back.
| A．have been | B．have gone | C．has been | D．has gone |
You'd better do it ________ your mother did.
| A．when | B．as | C．like | D．because |
______ they are brothers, they don't look like each other at all.
| A．Because | B． Though | C．When | D． As |
--- When did you know the news?
--- I knew nothing about it _________ my friend told me.
| A．after | B．it | C．because | D．until |
The question ______by us soon.
| A．is going to discuss | B．will discuss |
| C．is going to be discussed | D．has been discussed |