General Secretary, Xi Jinping, stressed that cross－strait cooperation would be strengthened________ the two sides could agree to oppose Taiwan independence．
| A．unless | B．even if |
| C．as long as | D．until |
Generally speaking, when _____ according to the directions, the medicine has no side effect.
| A．taken | B．taking | C．to take | D．to be taken |
The president spoke at the business meeting for nearly an hour without ______ his notes.
| A．bringing up | B．referring to |
| C．looking for | D．trying on |
The printer has left two lines from this paragraph.
| A．off | B．out | C．over | D．with |
The officer demanded that such things ______from happening again.
| A．prevented | B．prevent | C．be prevented | D．were prevented |
The secretary worked late into the night,_______ a long, speech for the president.
| A． to prepare | B．was preparing | C． prepared | D．preparing |