—Please go on with your demonstration．
—But where was I?
—Well, you_____the two chemicals together．
| A．tried to mix | B．were trying to mix |
| C．were trying mixed | D．had tried to mix |
. The camera isn’t good enough; I want to change ______.
| A．another | B．a good one |
| C．it with another | D．it for another |
The teacher told us that the problem was not _____ easy and that we should think _____ over carefully.
| A．such, it | B．that, it |
| C．such, 不填 | D．that，不填 |
It was a matter of _____ would take the position.
| A．who | B．whoever |
| C．whom | D．whomever |
Sarah hopes to become a friend of _____ shares her interests.
| A．anyone | B．whomever |
| C．whoever | D．no matter who |
_____ comes to see me, tell him I’m out.
| A．Anyone | B．Who |
| C．Whoever | D．Everyone |