She ______ (不得不) stay at home because her mother was ill.

[    ]

　　A. have to    B. has to    C. had to

I have to ________ ________ all night because I will have a test tomorrow.

2．我已经做了好多家务活现在我觉得筋疲力尽。

I’ve done much housework and I am very ________.

3．只有我一个人犯错误，我觉得很尴尬。

Only I ________ a mistake, I felt _______.

4．这个人宣布外星人已经在地球上着陆了。

The man ________ aliens ________ ________ on the earth.

5．这个消息是这样的令人信服以致很多人逃离家园。

The news was so ________ that many people ________ from their homes.

It seems that I have to ________ ________ ________.

It is raining. I have to stay at home.

[    ]

　　A. 不得不   B. 有必要   C. 最好   D. 愿意

外面正在下面，我们不得不推迟运动会。