Pieces of bamboo or wood ________ books between 2nd and 5th century AD.
A. used to formed B. used to form
C. were used to form D. used to beforming
All the books donated by the students from urban schools are said ________ to the students in the earthquake-stricken areas the other day.
| A．to have been sent | B．being sent |
| C．having been sent | D．to be sent |
I will be surprised if you can get Calvin, who is a close-fisted man, ________ these donation draw tickets from you.
| A．buy | B．buying | C．to buy | D．buys |
The fog was so heavy this morning that drivers could hardly ________ the things just ten meters away from them.
| A．turn out | B．look out |
| C．let out | D．make out |
This is the most serious and worst situation ___ I have ever experienced as a fan of the NBA.
A. whichB. thatC. when D. where
--- She should have been warned of the danger before she carried out her traveling plan.
--- ______, but she wouldn’t listen to me.
| A．So had she | B．So she had |
| C．So she was | D．So was she |