Bill was doing a lot of physical exercise to build up his_______.

Tom is one of the best students in the school and there is no _______that he will get the first prize in the competition.

——Do you think I should wear a hat to the party?——It all depends on your own__________.

The speech that Mr.Smith made today gave a strong ______ on the students.

 Most air pollution is caused by the burning of _________ like coal, gas and oil.