The oil must be used up, the light went out.
| A．for | B．because | C．since | D．as |
Please do me a favor — ______ my friend Mr. Smith to Youth Theater at 7:30 tonight.
| A．to invite | B．inviting | C．invite | D．invited |
— It’s the office! So you ______know eating is not allowed here.
— Oh, sorry.
| A．must | B．will | C．may | D．need |
Nowadays people sometimes separate their waste to make it easier for it ______. .
| A．reusing | B．reused | C．reuses | D．to be reused |
She is very dear to us. We have been prepared to do ______ it takes to save her life.
| A．whichever | B．however | C．whatever | D．whoever |
Would you please keep silent? The weather report and _________I want to listen.
| A．is broadcast | B．is being broadcast |
| C．has been broadcast | D．had been broadcast |