Modern science has given clear evidence ______ smoking can lead to many diseases.
A. what B which C. that D where
We won’t give up ______ we should fail twenty times.
| A．even if | B．since |
| C．whether | D．until |
Honey, it’s your turn __________ the dishes.
| A．cleaning | B．to clean |
| C．of cleaning | D．to be cleaned |
Hawking is known _________ the greatest scientist alive.
| A．of | B．for | C．as | D．to |
“China is still a developing country ___________.” said Premier Li at the conference.
| A．at present | B．for present |
| C．to present | D．to now |
The policeman warned us ___________ believe such liars again.
| A．not | B．don’t |
| C．didn’t | D．not to |