缺词填空

　　One Sunday, Mark decided to go sailing(航海)in his boat with his friend Dan, but Dan happened to be away．Dan's brother John offered to go i 　　1　　 though he did not know anything about sailing．Mark a 　　2　　 and they set out to sea．

　　Soon they found themselves in a thick fog．Mark was afraid they would be h 　　3　　 by a big ship．Just at that time he saw a large buoy(浮标)through the fog, so he decided to tie the boat to it for s 　　4　　 ．As he was getting onto the buoy, however, he d 　　5　　 the wet rope(绳)．The boat moved away in the fog, carrying John w 　　6　　 didn't know how to use the radio．He drifted about(漂泊)and was not seen u 　　7　　 twelve hours later．

　　Mark s 　　8　　 the night on the buoy．In the early morning he fell asleep．He was having a bad dream when a shout woke him up．A ship, Californian, came up and he c 　　9　　 onto it and thanked the captain．The captain told him that John had been s 　　10　　 by another ship and the ship's captain had sent out a message．" Without the message, I wouldn't have found you on the buoy, " he said．

On October 15, 2003 China _________ its second lunar orbiter Chang'e 2．

A．set out

B．set off

C．sent up

D．sent out