22
Change the sentence into conditionals.
We wore masks during the experiment because these chemicals gave off fumes that could be harmful
If these chemicals hadn’t given off fumes that could be harmful, we wouldn’t have worn masks.
If these chemicals don’t give off fumes that could be harmful, we won’t wear masks.
If these chemicals had given off fumes that could be harmful, we would have been worn masks.
If these chemicals had been give off fumes that could be harmful, we would worn masks.
Change the sentence into conditionals.
The gas escaped through the tube during the experiment because scientists weren’t so attentive.
If the scientists had been more attentive, the gas wouldn’t have escaped through the tube.
If the scientists don’t be more attentive, the gas will not escape through the tube.
If the scientists had more attentive, the gas would not escape through the tube.
If the scientists had more attentive, the gas would escape through the tube.
First computers were ______ in size
Huge
Small
Little
Long
Several decades ago, calculation was accomplished without___________
Calculators
Computers
Mobile phones
Technological devices
____________ were prototypes of modern PC.
Typewriters
Technological devices
Mobile phones
Computers
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