The storm sweeping over this area now is sure to cause _____ of vegetables in the coming days.
| A．rarity | B．scarcity | C．invalidity | D．variety |
To keep slim, many young girls prefer going on a ______.
| A．food | B．diet | C．healthy | D．dinner |
—What do you think of the story?
—Wonderful! It ______ my childhood.
| A．reminds me in | B．reminds me of |
| C．brings me to | D．reminds me to think of |
______ life began on earth is one of the biggest puzzles that scientist found hard ______.
| A．How; solving | B．When; to be solved |
| C．How; to solve | D．Which; to solve |
President Obama held talks with Chinese President Hu Jintao in Beijing, ________ economic recovery, climate change and stopping the spread of nuclear weapons.
| A．which was discussed | B．in which they-discussed |
| C．when they discussed | D．which discussed |
The government has taken some measures to solve the shortage of electricity, but it may be some time ________ we have enough power.
| A．since | B．after | C．unless | D．before |