It is a very ___ (use) book for language learners to improve

It is a very (useful,有用的) book for language learners to improve writing skills.
改为同义句.
1、Where is your pen pal from?
Where does your pen pal come from?
2、He didn't want to do anything.
He wanted to do nothing.
3、It's time for dinner.
It's time to have dinner.
4、出门的时候我忘记带钥匙了.
I (fortot to) take the key when i went out.
5、萨姆开始好好学习了.
Sam （began to study） hard.

1. useful 有用的

2. Where does your pen pal come from?

3. He would like / want to do nothing.

4. It's the dinner time.

5. forgot to

   forge...

Where does your pen pal come from?
He wanted to do nothing.
It’s dinner time.(说实话这个不确定)
I forgot to take the key when I went out.

USEFUL WHERE DOES YOUR PEN PAL COME FROM HE WANTED TO DO NOTHING DINNER`S TIME