I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests．
| A．不填; 不填 | B．不填; a | C．a; 不填 | D．a; a |
The film star wears sunglasses. Therefore, he can go shopping without ______..
| A．recognizing | B．being recognized |
| C．having recognized | D．having been recognized |
We __________ back in the hotel now if you didn’t lose the map.
| A．are | B．were |
| C．will be | D．would be |
Some people believehas happened before or is happening now will repeat itself in the future.
| A． | whatever | B． | whenever. |
| C． | whereever | D． | however |
I found the lecture hard to follow because itwhen I arrived.
| A． | started | B． | was starting |
| C． | would start | D． | had started |
--- What time is it?
--- I have no idea. But just a minute, I ______ it for you.
| A．check | B．checked |
| C．will check | D．would check |