ou read the book, you’d better make a mark _____you have any questions.

Of all the sports shoes, John bought ______ pair. Then he had some money for socks.

__________ it is from our own planet Earth to Mars!— Yes, it takes months to travel to Mars by spacecraft.

The glass door have taken the place of the wooden onesat the entrance, _____ in the natural light during the day.

It is a fact that there is atowards regional cooperation.