在下列各句的空白处填入一个适当的词, 使句子意思完整，语法正确。
The best way to improve your English is to _________an English club.
Most teenagers are _________of snakes. They are dangerous animals.  
The boy is old enough, he should be _________to choose his own friends.
I don’t want to let my mother _________, so I’ll study hard to get good grades.
Bob is easy to get _________ with. His classmates like to be friends with him.