____ you pull the hand levers on the back of the handlebars, it causes the bicycle to stop moving. Keep your back straight, ____ you steer your bicycle with the handlebars. ____ air is pumped into the pipe of the rocket, the air pressure pushes the rocket in an upward force. ____ the rocket is launched, it shoots up at a very high speed.

Subordinating Conjunctions

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オプション

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