Даны точки А(3;-2;1), В(4;0;-8), С(-5;4;-2), Д(-4;6;-11). Среди векторов АВ, ВС, ВД и АД найти равные.

Являются ли векторы а(1;-1;2) и в (-1;-2;1) перпендикулярными?

Complete the sentences. Use the correct form of the verb in brackets.

1   I remember ________ (play) on the beach when I was about three years old.

2   If the exam had been last week, I’m sure I  ________ (not pass) it.

3   Catherine apologized to me for ________ (be) so moody all week.

4   Neil wishes he ________ (speak) better French. His company are going to send him to Paris.

5   The girl denied ________ (take) my mobile phone.

6   She ________ (not meet) Paul if I hadn’t introduced them.

7   I wish I ________ (not put) on these shoes today. They’re really uncomfortable.

8   I’m really sorry – I forgot ________ (post) the letter you gave me.

9   If I ________ (be) you, I wouldn’t drive that old car.

10   Rebecca convinced me ________ (not go) to the cinema with Harry.

Complete the sentences with one word.

1   What music is this? It sounds ____ Beethoven.

2   I’m afraid you can’t come with us. There’s ____ room in the car.

3   ____ of my two sisters looks like me. They’re both dark and I’m blonde.

4   I’m ____ to getting up early. I’ve been doing it for years.

5   I can’t ____ used to working every day. I’d love to be a student again!

6   I was really angry when Jack accused me of ____ telling the truth.

7   I didn’t enjoy the concert even ____ it was my favourite band.

8   That’s my colleague ____ husband works for Bill Gates.

9   You shouldn’t ____ said that to her. You know how sensitive she is.

10   You look ____ if you have seen a ghost! What’s the matter?

11   I wish my parents ____ stop arguing about money all the time.

12   My eldest brother, ____ is a doctor, speaks German fluently.

13   She ____ have left already – her car is still outside the house.

14   ____ the terrible weather, we still had a great time camping.

15   We’re ____ the roof repaired on our house at the moment. We’d like to sell it next year.