31. All the things ______ must be done well.
| A．worth to do | B．worthy of being done |
| C．worthy doing | D．worth of doing |
My son set out _____ questions when I set about ______lessons.
| A．asking; preparing | B．to ask; to prepare |
| C．asking; to prepare | D．to ask; preparing |
--What do you want to do next? We have half an hour until the basketball game.
--____. Whatever you want to do is fine with me.
| A．It just depends | B．It’s up to you | C．All right | D．Glad to hear that |
____ her friend was badly hurt, she burst into tears.
| A．Hearing | B．Having heard | C．To hear | D．Heard |
___ from space, the earth with water ___70％ of its surface looks like a "blue blanket".
| A．Seen ;covered | B．Being seen; covers |
| C．Seeing; covering | D．Seen; covering |
I'm afraid that I can't make myself ___ because of my poor English.
| A．understand | B．understanding | C．to understand | D．understood |