2.They contained thousands of tubes. The tubes blew out constantly.

3.Graduate students ran up and down the computer room. They pushed shopping carts filled with replacement tubes.

4.These monstrous computers were marvels. They had less power than today’s handheld calculators.

2. They contained thousands of tubes the tubes that blew out constantly.

3. Graduate students ran up and down the computer room, pushing shopping carts filled with replacement tubes.

4. These monstrous computers were marvels, but they had less power than today’s handheld calculators

2. tubes. The

3. room. They

4.marvels. They