英语A级语法题

1. In spite of what we said, he refused to ________ to the police station. A) give away B) give off C) give himself away D) give himself up 2. It is imperative that the students ________ writing their papers by the end of the month. A) finish B) must finish C) will finish D) are to finish 3. I invited Tom and Ann to dinner, but ________ of them came. A) both B) none C) either D) neither 4. The heart is an important organ of circulation ________ function is to pump blood to all parts of the body.