_____ is known to everybody, the moon travels round the earth once every month.
| A．It | B．As | C．That | D．What |
Attention, please. The plane to London _______ off at 9: 00.
| A．take | B．takes | C．took | D．has taken |
The Spring Festival falls ________ the first day of the Chinese Lunar year.
| A．in | B．at | C．on | D．for |
Do you still remember the chicken farm _____ we visited the other day?
| A．where | B．when | C．that | D．what |
It is diving _____ great speed that often causes serious accidents.
| A．on | B．at | C．for | D．in |
______ is necessary for everyone to obey the traffic rules.
| A．That | B．This | C．What | D．It |