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.

1 That's the computer that I'd like to buy.

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.