By the time he was seven he had learned _____ 2000 English words.
She has been warning________the danger of driving the car________a high speed.
________about Jane,the teacher called her parents to find out why she was often absent from school.
As modern equipment is being used widely,the factory________some of its workers with robots.
Air pollution will get worse and this will do________to people,for example,it can cause cancer.
________,she fell to the ground,never to wake up again.