The flu is believed _______ by viruses that like to reproduce in the cells inside the human
nose and throat.
| A．causing | B．being caused | C．to be caused | D．to have caused |
__________ you understand the rule, you will have no further difficulty.
| A．While | B．Once | C．Though | D．Unless |
—He isn’t particular about his food.
—Yes, he eats_____________ anything.
| A．nearly | B．mostly | C．almost | D．possibly |
Flight BA 123 to Vienna is now boarding at_______.
| A．Gate 21 | B．21St Gate | C．the Gate 21 | D．21 Gate |
He didn’t seem to mind_____________ TV while he was trying to study
| A．them to watch | B．that they watch |
| C．their watching | D．watching |
I don't skate now, but I___________ when I was a kid.
| A．used to | B．am used to it | C．sued | D．used to do |