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ten-minute, much, cost, call, how, would, a?

as, the, leaving, just, doorbell, was, rang, the, he, house.

ago, in, injured, two, accident, weeks, he, traffic, was, a.

to, Friday, uncle, is, my, dinner, coming, on.

doing, have, yesterday, you, been, what, since?

it, drink, hot, coffee, can, so, not, this, I, is, that.

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1. helps
2. clean
3. are coming
4. goes
5. eat

1. Did Lisa swim in the lake? Was Lisa swimming in the lake?
2. Did you brother help you? Was your brother helping you?
3. Did Doris wash her T-Shirt? Was Doris washing her T-Shirt?
4. Did the run home? Were they running home?
5. Did Henry listen to the radio? Was Henry listening to the radio?
6. Did the boys carry the buckets? Were the boys carrying the buckets?
7. Did we make breakfast?
8. Did Ron and Fred check the computer? Were Ron and Fred checking the computer?

There are different types of computer. The (largest) and (most powerful) are mainframe computers. Minicomputers are (smaller) than mainframes but are still very powerful. Microcomputers are small enough to sit on a desk. They are the (most common/the commonest) type of computer. They are usually (more powerful) than minicomputers.
Portable computers are (smaller) than desktops. The (largest) portable is a laptop. (Smaller) portables, about the size of a piece of writing paper, are called notebook computers. Subnotebooks are (smaller) than notebooks. You can hold the (smallest) computers in one hand. They are called handheld computers or palmtop computers.