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。（5分）

小题1: The best way to improve your English is to _________an English club.

小题2:Most teenagers are _________of snakes. They are dangerous animals.  

小题3: The boy is old enough, he should be _________to choose his own friends.

小题4:I don’t want to let my mother _________, so I’ll study hard to get good grades.

小题5:Bob is easy to get _________ with. His classmates like to be friends with him.

吸收过程一般只能在填料塔中进行。