Many boys enjoy _______ football, basketball or baseball

Which do you think is ________, health or wealth？

_______________will not continue if an ongoing operation is changed or deletedA、

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

And they can ______their passports______，making leaving or “escaping” virtually impossible.

Either he or I ______to the airport.

FTP客户上传文件时，通过服务器20端口建立的连接是____,FTP客户端应用进程的端口可以为____.

Duty is an act or a course of action that people __________you to take by social customs, law or religion.

FTP客户登录后上传文件使用的连接是__（49）__，该连接的默认端口为__（50）__。

FTP只能识别两种基本的文件格式，它们是_______。

FTP只能识别两种基本的文件格式，它们是______。