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

---What is your favorite______of sports clothing? ---Nike.

In my opinion, the most famous 　　　　 to tourists in the city is the wooden tower.

 You are _________ to have such a good teacher.

. Probability is the mathematical study of the _____ of an event’s occurrence.