Because of the Russian gas limit to Europe, attempts _______ to use botanical fuel as a source of power.
| A．have made | B．having made | C．are being made | D．will be making |
_____it is to jump into a river to swim on such a hot day.
| A．What a fun | B．What fun |
| C．How funny | D．How a fun |
________ the final exam________ up soon, we should get down to our studies.
| A．With; comes | B．Because; come |
| C．With; coming | D．Because of; will come |
In recent years, with the help of our teacher, I have made_____ rapid progress in ____math.
| A．a; the | B．a; 不填 |
| C．不填; the | D．不填; 不填 |
Several weeks had gone by _______ we realized the painting was missing.
| A．as | B．since |
C．before | D．when |
Although _______ of danger, tourists can't help taking photos near the cliff.
| A．having warned | B．warned |
| C．warning | D．to be warned |