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  How can you fill a balloon with air without blowing it up? Read these steps.

  1.Get a balloon, an empty soda-pop bottle, some baking soda, and some vinegar (醋).

  2.Put two teaspoons of baking soda into a balloon.

  3.Pour one inch of vinegar into the empty bottle.

  4.Put the neck of the balloon tightly over the neck of the bottle.

  5.Shake the bottle so that the baking soda will fall in.

  6.In a few minutes, the balloon will begin to fill with air.

  7.The baking soda and the vinegar mix together to form a gas. This gas fills the balloon.

1.Which step has a list of four things to use?

[  ]

A.step 1
B.step 2
C.step 4
D.step 7

2.Where do you put the baking soda?

[  ]

A.into an empty bottle
B.into a balloon
C.in the air
D.in a corner

3.How much vinegar should you use?

[  ]

A.one spoon
B.one cup
C.one inch
D.one pound

4.When do you shake the bottle?

[  ]

A.after step 4
B.before step 3
C.before you start
D.in step 7

5.The baking soda and vinegar mix together to make ________ .

[  ]

A.a balloon
B.money
C.a gas
D.a bottle
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