The group’s research has done much to our knowledge of the HIV virus.
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.
The hotel which _______ now is to be a five-star one