There are many cars coming up and down. If you insist on standing there, you will risk _________ down on the ground.
| A．knocking | B．to knock | C．being knocked | D．knocked |
It is well known that too much ________ to the sun can promote the development of many skin cancers.
| A．contact | B．disclosure | C．exposure | D．exhibition |
I recommend you _______ the new restaurant on the corner; the food is excellent.
| A．would try | B．tried | C．trying | D．try |
Bacteria do not develop at low temperature, so that food can be _______ in cold storage.
| A．deserved | B．reserved | C．preserved | D．conserved |
These pictures _______ us of the happy days which we spent together on the campus.
| A．remained | B．reminded | C．informed | D．reformed |
They have always treated us with open hands and we must be generous ________.
| A．in return | B．in addition | C．in vain | D．in case |