respond to（反应）, appeal to（吸引）, catch on to（理解）, listen to （收听）,used to（过去常常）, give birth to,attend to（照料）, see to（负责）, be entitled to（有权）, belong to（属于）, come to（苏醒）, stand up to（勇敢面对）, help oneself to（请自便）, refer to,to the point（切题）,

　　Train them to stand up to any severe test in hard.

　　The ticket entitled you to a free meal in the luxury hotel.

　　See to it that the children get a hot meal after their swim.

　　You will catch on to the job shortly after wards.

　　People usually refer to television for up-to-the-minute news.