Your return ticket is________for three months.[ ]

The child was toldto ______ for being rude to his uncle.

Whenever I met her, __________ was very often, she greeted me with a sweet smile.

I’d love to go to the party with you tonight.— Oh, I’m sorry, there________be a party because of the coming exam.[ ]

ing to Charles Keeling, the amount of carbon dioxide ________ sharply and steadily over the forty years between 1957 and 1997.