Today, computers are really helpful. They ___

Today, computers are really helpful. They ____ everywhere.

#44613

use

are used

used

were used

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--When _____ the abacus _____?   -- In the sixth century by the Chinese people.

#44867

is, invented

did, invent

was, invented

does, invent

A lot of trees ______ on the hill yesterday.

#44945

are planted

will be planted

have been planted

were planted

We ____ not to play computer games.

#44747

are told

have told

told

tell

The words that we should pay attention to ________on the blackboard.

#44787

being written

are written

is writing

writing

These days students in some schools ______ not to use mobile phones.

#44924

ask

asked

are asked

were asked

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