--- What a lot of fun it is to play on a frozen sports field!
--- Isn’t it rather risky, ?
| A．though | B．also | C．either | D．too |
—Alice, you look puzzled．Haven’t you understood it?
—Yes．I _____of another problem just now．
| A．had thought | B．have thought | C．thought | D．was thinking |
By looking at a problem in as many ways as possible, creative thinkers can find solutions that would _______ remain invisible．
| A．otherwise | B．yet | C．already | D．fo rever |
—What do you think of the performance today?
—Great! but a musical genius could perform so successfully.
| A．All | B．None | C．Anybody | D．Everybody |
Get out of here at once. _________ not, I’ll phone the police.
| A．Since | B．If | C．Why | D．When |
she is not so cheerful she used to be?
| A．How is it that；as | B．Why is it that；what |
| C．Is it why；that | D．How it is that；as |