New Words：

fit [fɪt]
v.合身；适合
adj.健壮的；健康的

Sample Sentences：

The key doesn't fit the lock.
I can't find clothes to fit me.
I tried the dress on but it didn't fit.

It's a good way to keep fit.
She tries to keep fit by jogging every day.

New Words：

catch up with v. 赶上；追上

Sample Sentences：

I think it easy for me to catch up with him.
I'll catch up with you no matter how fast you run.
If a good runner like you can't catch up with him, how can I?
I hurried to catch up with him and tell him to take the wrong things.

New Words：

usually [ˈjuːʒuəli] adv. 通常；一般；常常

Sample Sentences：

I usually go to work by bike.
We usually stay home on Friday nights.
What time do you usually wake up in the morning?
Usually if you tell a lie, you have to tell another lie.

New Words：

usual [ˈjuːʒuəl] adj.通常的；平常的；寻常的；惯常的
as usual 像平常一样；和往常一样

Sample Sentences：

He came home later than usual.
I got up an hour earlier than usual.
She sat in her usual seat at the back.
It was such a hot day that they didn't go out for a walk as usual.
What is the matter with you? You seems not as hardworking as usual.

New Words：

shadow [ˈʃædoʊ]
n.阴影；影子；昏暗处
v.跟踪；盯梢；在…上投下（或覆盖）阴影

Sample Sentences：

All he could see was his shadow.
You can't spend all your life chasing shadows. 追求虚无缥缈的东西
The trees threw long shadows across the lawn.
He was shadowed for a week by the secret police.