E-mails, though _______ exposed to misleading information, are considered far more convenient than traditional letters．
| A．occasionally | B．personally |
| C．smartly | D．Fortunately |
Sometimes in summer, when ______ sun is rising, you can still see ______ clear moon hanging in the sky.
| A．the, the | B．a, the | C．the, a | D．a, a |
______you are always optimistic and self-confident, I can't wait to make friends with you.
| A．Though | B．Since | C．While | D．So |
——How many of you made it to the top of the mountain in the end?
——______. It was really tough.
| A．No one | B．Neither | C．None | D．Nobody |
US house prices has risen by 12.4% over the 12 months to the end of July, completely ______his plan to buy another apartment.
| A．ruined | B．ruining | C．to ruin | D．ruins |
She had to work deep into the night, ______she couldn't have spread the messages to all the relevant people successfully.
| A．while | B．but | C．otherwise | D．so |