Firewall is a _______ mechanism used by organizations to protect their LANs from the Internet．

● Firewall is a ___(74)___ mechanism used by organizations to protect their LANs from

He gained his ______ by printing ______ of famous writers.

He gained his _____ by printing _____ of famous writers.

______ by his friend for his mistake, Jim felt very unhappy.

The boss told his secretary to _____ the documents for later use.

The correct tightening is obtained by the use of______to measure the extension given to the bolts.

The heat that is produced by burning garbage can be used to______.

Since his works earned him quite a reputation in Liverpool, he has stayed there most of his life, ________the visit to his hometown by chance.

4．Li Ping and her parents ．_________ going to visitBeijing tomorrow．

Peter spoke to a ______ consultant to finalize his ______ plans.

______are Intemet addresses used by Web browsers to locate Intemet resources．