Як маючи 2 посудини 5 л і 7 л налити з крану 6 л

Choose the best reply to the phrase:

-I have such bad marks at school! - ...

1) You can borrow my book.

2) You should study hard.

3)You can write a test.

4) Lets go to the gym. 

5) You must go to school now.

Один правильный вариант ответа, чисто для проерки :)