It can’t be a(n) _____ that four jewelry stores were robbed in one night.

(2013·陕西宝鸡二模)In his absence, I would like to thank all concerned on my brother's ________.

The government has been under growing pressure to ________ the causes of air pollution as smog frequently smothers the country’s large cities.

 My uncle’s house is much smaller than ours, but it is twice         expensive.

At the meeting, the old man _____ some good advice about bringing down the market price of housing.