．_________life began on the earth is one of the biggest puzzles to scientists.
| A．How | B．What | C．Where | D．That |
－It was careless of you to leave out some important information．
－Oh, my god! _______．
| A．So were you | B．So I did | C．So did I | D．So was I |
Tom doesn’t want to take part in any school activities,________.
| A．and David doesn’t too | B．and David doesn’t either |
| C．and so doesn’t David | D．and either does David |
—Will he be back by ten tonight? —No, _____.
| A．I think not so | B．I’m not afraid | C．I’m afraid not | D．I don’t hope so |
—Tom, would you like to come to our dinner party?
— _____.
| A．Yes, I would | B．Sure, it’s my pleasure | C．No, I can’t come | D．Yes, with pleasure |
I don’t doubt ________ the plan will be well-conceived.
| A．that | B．whether | C．why | D．when |