We should ________ ‘Thank you’ when we borrow something from someone.

Do you know how this disabled man succeeded in running such a big company— I don’t know , but I think he __________ many difficulties.

Until the noise of the bus ________, we were able to hear the program again. [ ]

The air pollution is terrible.— It will be worse we take action to protect the environment.

Have you got any idea for the summer vacation? — I don’t mind where to go ________ there’s sun, sea and beach