There are certain _______when you have to interrupt people who are in the middle of doing something.

Being able to speak another language well is a great _____ when you're looking for a job．

The system has been designed to give students quick and easy_____to the digital resources of the library.

The practice of hanging clothes across the street is a common ______ in many parts of the city.

The top leaders of the two countries are holding talks in a friendly________.

Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.

Mr. Barren doesn’t think that all bad language should be allowed. In his opinion, there are ___________ that should be kept up.

In a time of social reform, people’s state of mind tends to keep _______ with the rapid changes of society.

Swimming is ___ in summer.

From their _____on the top of the TV Tower, visitors can have a better view of the city.

—He says that my new car is a ____________ of money.—Don’t you think those words are just sour grapes?

The World Health Organization gave a warning to the public without any ____when the virus of H1N1 hit Mexico in April, 2009.

My morning  ______ includes jogging in the park and reading newspapers over breakfast.

I can’t say which wine is beat—it’s a （n）_____of personal taste.

I bought a dress for you only 10 dollars in a sale; it was a real _____.

He came here without friends or ______and made his fortune.

—Who did you stay with ?—_____________.                           

She is in a poor ________of health, which worries her mother much.

The Chinese are looking forward to the first_________to land on the moon after Yang Liwei’s successful trip to space.           

There’s no __________from my bedroom window except for some factory chimneys.