—Credit cards are       useful when traveling.—True. They save us the trouble of taking too much cash.

Scientists have come to the conclusion_______ the temperature on Earth is getting higher and higher.

Lily has been in love with Tom ___ since she met him last year.

Great inventors don’t ________ graduate from famous universities. Some didn’t even go to university.

During the summer vocation we went back to the school __ to pay a visit to our teachers though it was _____ hot.