His explanation was so confusing that I could hardly make any    of it at all.

Chemical processes _______in the treatment of materials for clothes _______the environment badly in some countries nowadays．

When the teacher told the boy to sit down, he _____ to her and said she couldn't make him.

In a courtroom it is sometimes difficult to ______ who is innocent and who is guilty．

— So, how is your new roommate ?— She really ____. She always making loud noises at midnight and when I remind her , she always makes rude remarks.