Some researchers believed that there is no doubt______ a cure for AIDS will be found.
| A．which | B．what | C．that | D．whether |
His grandmother’s back was bent with ___.
| A．age | B．year | C．old | D．day |
It is ___ to observe traffic rules.
| A．of great importance for us | B．important to us | C．great importance of us | D．of great importance to us |
The climate of Asia can ___ be spoken of as a whole.
| A．almost | B．hardly | C．nearly | D．mostly |
As each candle burned four hours, the six candles ___ twenty-four hours.
| A．continued | B．lased | C．spent | D．cost |
It began to rain, ___ was exactly what we wanted.
| A．that | B．what | C．which | D．it |