根据下列句子及所给单词的首字母，在答题卷上按题号写出各单词的完全形式（每空限填一词）。
My brother finds watching English-language videos f________  because the people speak too quickly and he can’t follow it.
The students are all busy getting ready for the f________ exam.
Michael Jackson died at the age of 50 and his d________ made us shocked and sad.
I would like to r________ to your e-mail, but I don’t have time.
He u________  to cause lots of problems for himself and his family, but now he has changed.
The dictionary b________ to my sister. Look! Here’s her name on it.
--- Who t________ you math last term?
--- Mr. Zhao.
People like to talk to Linda because she is a good l________.
I d________ the letter into the mail-box in front of our school just now.
I think there are m________ of stars in the sky.