4,5,10,14题 

4。 B; be fluent in English 流利说英语。be familiar with 熟悉5。B; should make every possible use of sth 改变为被动成为every possible use should be made of sth10 D; It was a voice (that) Mark recognized, 其中(that) Mark recognized是定语从句。意思是这是马克熟悉的声音。14 A; come up 发生