My father began to work ______ a bus driver when he was 20 years old.
This machine is very easy . Anybody can learn to use it in a few minutes.
My sister met him at the cinema yesterday afternoon, so he your lecture.
_____ many times, he finally understood it.
At the eve of Christmas, she got nothing but $ 2 ____ to buy her husband a simple present.
_____ private cars bring us convenience, they also cause more traffic accidents and pollution.