单选题 I have always （ ） you my best friend.

单选题 It （ ） millions of people several years to build the Great Wall.

单选题 If I take this medicine twice a day, it should （ ） my cold.

单选题 It is （ ） of you to turn down the radio while your sister is still ill in bed.

单选题 He is always kind , never cruel , （ ） to people or to animals.

单选题 when she saw the clouds she went back to house to （ ） her umbrella.

单选题 It's not quite （ ） that he will be present at the meeting.

单选题 It was difficult to guess what her （ ） to the news would be.

单选题 The metals which we find in the earth （ ） iron , lead and copper.