She sat at the desk and set about _____ a letter to her friend.
| A．to write | B．writing | C．write | D．written |
It's __________ comfort to know there is someone to keep __________ eye on the kids.
| A．a; the | B．/; an | C．a; an | D．/; the |
Now what we need is something __________ will make human beings live better.
| A．who | B．that | C．as | D．what |
—Would you like to play bridge with us? —Sorry. __________.
| A．With pleasure | B．No problem |
| C．It isn't my cup of tea | D．It is a piece of cake |
Please let me know __________ you want to go or not.
| A．when | B．that | C．how | D．whether |
It took __________ building supplies to construct these energy-saving houses. It took brains, too.
| A．other than | B．more than |
| C．rather than | D．less than |