Only after Mary read her composition the second time__the spelling mistake
| A．did she notice |
| B．she noticed |
| C．does she notice |
| D．she has noticed |
It’ll be another 50 years _________ China is expected to reach the level of a medium developed country.
| A．since | B．before | C．that | D．when |
What about todays temperature?
-- Its the same as, if the weather report is exact as usual, ___ of yesterday.
| A．one | B．it | C．that | D．what |
Most environmental problems exist because adequate measures for preventing them ____in the past.
| A．not being taken | B．didn’t take |
| C．were not taken | D．haven’t taken |
—Go for a picnic this weekend, OK?
—__________. I love getting close to nature.
| A．I couldn’t agree more | B．I’m afraid not |
| C．I believe not | D．I don’t think so |
__________ Tom didn’t pass the exam made his parents very upset.
| A．Which | B．What | C．That | D．When |