Choose the correct answer. Выберите правильный ответ.

1. Don't worry about me, Mom. I am a student. I am supposed to spend a lot of time studying.
And I _______________ (stay up) late.

used to stay up
would stay up
am used to staying up

2. She _____________ (have) a pet chimp. We loved to come visit her!

got used to having
used to have
would have

3. __________ Tony has a very good foundation in English, he had little difficulty in passing the examination.

Because of
As
Due to