—Why does the lake smell terrible?
—Because large quantities of water_______________.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
Please give Jim the schedule for tomorrow’s conference when he _____ back. He is to chair the conference.
| A．will come | B．is coming |
| C．comes | D．came |
—If you are free，I’ll invite you to see a film tomorrow.
—.It couldn’t be better.
| A．I’m sorry | B．Thank you |
| C．That’s right | D．Don’t mention it |
This ruler is too short. I need a one.
| A．long | B．longer |
| C．more long | D．more longer |
Please remember nothing can be learned ______ hard work.
| A．by | B．at | C．without | D．for |
—Susan, go and join your sister cleaning the yard.
—Why ____? John is sitting there doing nothing.
| A．him | B．he | C．I | D．me |