If you ______ ______ ______,you must keep it.如果
If you ______ ______ ______,you must keep it.如果
You must keep the bedroom ______(clean)
You must keep ______ when you are in danger.
If you keep on ,you'll succeed ______.
We must think of ______ if it’s like what you said.
You must give it back to ______ it belongs to.
It's______,so you must ______ to finish it.
— ______ you ______
If you eat more vegetables and fruit,you'll keep ______(健康的)
can you spell it?______.
You must know the traffic ______ if you walk ____ a city.
You must return this book if you want to borrow ______.(选择题)