Being constantly exposed to advertisements is annoying, but it ______ be pleasant sometimes.
—Who do you think will get the first prize?—Mary, of course. She ________ for the competition for months.
She didn’t come to the party last Sunday. _________, she must have made the party more exciting.
Jack is good at English but he doesn’t like physics. _________ his twin brother.
Many people agree that _________ knowledge of English is a must in _________ international trade today.
Suddenly they noticed a house with two big trees _______ in front of it.