He spent a large ___ of money on his books.
| A．deal | B．plenty | C．number | D．amount |
I couldn't imagine ________ difficult it was for these badly injured victims to make it to the hospital.
| A．when | B．how |
| C．what | D．where |
After a day's exhausting climb we arrived at ________ we had been told was Garden in the Air.
| A．what | B．which |
| C．that | D．where |
The mother, who is strict with her two daughters, has a clear list of ________ they are not permitted to do.
| A．why | B．how |
| C．what | D．which |
Rosa regretted giving her opinion about the decision directly, feeling ________ she should have expressed it differently.
| A．how | B．why |
| C．that | D．if |
You must notice ________ the emergency exit is when you enter the building.
| A．which | B．where |
| C．what | D．in which |