Could people become infected ____ HIV by swimming in a pool or sitting in a bath?
| A．of | B．into | C．with | D．to |
After Jack had sent some e-mails, heworking on his project.
| A． |
had started |
B． |
has started |
C． |
started |
D． |
starts |
He smiled politelyMary apologized for her drunken friends.
| A． | as | B． | if |
| C． | unless | D． | though |
George returned after the war, only _______ that his wife had left him.
| A．to be told | B．telling |
| C．being told | D．told |
It doesn’t matter ________ you pay by cash or credit card in this store.
| A．how | B．whether |
| C．what | D．why |
My first _______ of him was that he was a kind and thoughtful young man.
| A．expression | B．attention |
| C．satisfaction | D．impression |