24. —Who______ it be that is knocking at the door?
—It ______ be father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
He is such a lazy man _______ nobody wants to work with ______.
| A．that; / | B．as; him | C．whom; him | D．as; / |
—Sorry for being late for the party.
—________ earlier next time, will you?
| A．Coming | B．To come | C．Having come | D．Come |
Measures must be taken to prevent pollution ________ happily.
| A．from we live | B．for us to live | C．us living | D．from our living |
______ is surprising to us is that Tom, for ______ English was once boring, can speak English fluently as though he were a native speaker.
| A．What; whom | B．What; whose | C．It; whose | D．As; whom |
When the question _____ at the meeting, no one could answer it.
| A．rose | B．arose | C．came | D．raised |