4. The huge picture looks more beautiful _____ the blue sky.
I shall never forget those days ________ I stayed on the island ________ you visited last week.
_______ is reported in the newspapers, the war in Libya has come to an end.
The radio club in our school, _______ used to be poorly run, is now very popular among students.
Children who are not active or _______ diet is rich in fat will put on weight easily.
— What do you think of our school, Thomas? — Terrific! It is a school _______ everybody tries his best to improve himself and keep up with others.