My English name is Mary. Each of the students in our class 　　　 given an English name. 

A number of students        trees every year and the number of them        increasing.

Listening to loud music at rock concerts _____ caused hearing loss in some teenagers.

 There ________ lots of changes in our school in the last few years.

I took mathematics and physics because I think that ________ very important for me to make further research in this field.