Bob has learned a lot from his _______ of working in different gyms and is now an expert on all kinds of _______. 

Before the final examination, many students have shown ____ of tension. Some have trouble in sleeping while others have lost their appetite.

—Henry has been teaching English in Beijing university for many years.—It’s no __________ he can speak Chinese so well and idiomatically.

 Giving up smoking is a slow and painful _______ for him.

The two ships came into ____ and 100 people were skilled.