What is the main concern of man on the fourth level?

For this part, you are supposed to write a composition of about 100 -120 words based on the following situation. Remember to write it clearly.你(Li Yuan)给你的朋友(Jane)写封信，邀请她参加你的生日聚会。信的内容包括：(1)告知对方聚会的具体时间、地点；(2)到达聚会地点的行车路线及便利的交通丁具；(3)要求对方就是否能参加聚会作回复。

So they took him to a part of the ship where there was【C13】______enough for just one man.

A door closed over his head and【C14】______a minute Ralph

Suddenly he felt the rocket【C15】______down and then stopped.

The spacemen knew that it was【C11】______for Ralph to leave.

He could not live up there【C12】______longer without special air or suit like theirs.

 " he【C10】______, "

even stand【C9】______his own feet.

than he felt at first. He felt【C8】______light that he could not

Soon it became【C7】______harder for Ralph to breathe