. Scientists have to work hard to keep _____ with modern discoveries and developments.

He put in a special _____ for an extra day's holiday so that he could attend his daughter's wedding.

Professor Jordon is well known for his _____ into the habits of the common housefly.

She is making herself ill with _____ over her son's future.

Our Party has always devoted great attention to raising the living _____ of the working people.

Radar enables the pilot of an airliner to take off, fly and land in _____.

When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.

The police is offering a(n) _________ of $2000 to anyone who will provide information about the lost boy.

According to the instructions, the medicine can bring much _________ from the pain.

Traditionally, women in China are in red clothes on the wedding day, because red is the ______ of happiness and luck.