Question 40: Choose the letter A, B, C or D to complete the passage below.
"The Internet was born (1) _________scientists attempted to connect the American Defense Network to other satellite networks in (2) _________to exchange information. Soon, scientific and educational institutions as well as research departments became interested (3) _________ linking up, and, before long, the Internet had expanded into an international information and communication network. The Internet now (4) _________ all the countries in the world. You can be connected to the Internet directly through your own computer or you can hook up to (5) _________ access system which allows you to use some of the Internet’s services."
1. The Internet was born (1) _________scientists attempted to connect the American Defense Network
Explanation: when + clause of time
Attempt to V: trying to do something
Connect st to st: connect something to something