Complete the sentences, using who, which or that
1 That's the computer … I'd like to buy.
2 Core 2 Duo is a new Intel processorcontains about 291 million transistors.
3 A webmaster is a person … designs, develops and maintains a website.
4 A bus is an electronic pathway… carries signals between computer devices.
5 Here's the DVD … you lent me!
6 Last night I met someone … works for GM as a software engineer.
Explanation: "That" is used to refer to a specific object, in this case, the computer that the speaker wants to buy.
2 Core 2 Duo is a new Intel processor which contains about 291 million transistors.
Explanation: "Which" is used to provide additional information about the subject, in this case, the fact that the Core 2 Duo processor contains about 291 million transistors.
3 A webmaster is a person who designs, develops, and maintains a website.
Explanation: "Who" is used to refer to a person. In this case, it refers to the person who designs, develops, and maintains a website, which is the job of a webmaster.
4 A bus is an electronic pathway that carries signals between computer devices.
Explanation: "That" is used to refer to a nonspecific object, in this case, the electronic pathway that carries signals between computer devices.
5 Here's the DVD that you lent me!
Explanation: "That" is used to refer to a specific object, in this case, the DVD that the speaker borrowed from someone.
6 Last night I met someone who works for GM as a software engineer.
Explanation: "Who" is used to refer to a person. In this case, it refers to the person the speaker met, who happens to work for GM as a software engineer.