A qualified doctor has to constantly update his knowledge in order to maintain his professional _____.

At the party, all the others seemed to know each other well; Catherine sat alone at the table in a corner, feeling ________.

What shocked the police and the people around most was that the kidnapper suddenly ______his pocket and took out a gun in a desperate attempt to escape with the kidnapped child. 

As a businessman, Mr. Green is a complete failure. Being lazy may well be one of the______to his success.

It is reported that floods and serious loss of soil and water have _______an ample amount of mud in the Yellow River, making pumping water out of it hard for farmers around.

When Peng Liyuan , First Lady of China , made her first public appearance overseas, her grace and perfect dress  have earned her international ________.

The Fifth Euro-Asia Economic Forum, held in Xi’an on 1st October, 2013, is aimed to ____ economic exchanges between Asia and Europe.

 My interest in surfing on the Internet has_______ most of my spare time, but it has repaid me a great deal of enjoyment.

-- I’m going on a vacation. You can’t imagine 6 months of hard work without rest.-- You certainly _____ a good rest.

--I hear that the famous singer Eason Chan will sing at Beijing New Theatre.--Really? Where did you _____? 

Mr. Smith is _______ a teacher.  He is a friend as well.  We all respect him.

The story happened in________ and the hero was in his________.

 About________of the workers in that steel works________ young people.

As we know, a red jacket doesn’t _____ green trousers. But when a little girl wears them, they ____her very well.

Shortly after the accident, _____ policemen were sent to the spot to keep order.

 It's a rule for all the students to _____ their places ahead of 5 minutes waiting for the class to be started.

The air is deadly polluted because some factories don’t    __the rules to protect the environment.

 In ____, he began to learn Russian, when he was in ______. 

 Nowadays, no single country can successfully ____ the global problems alone.

Although we hadn’t seen each other for twenty years, Jack and I _________each other at the first sight at yesterday’s party.