Most people agree that a pet adds joy to a person’s life. Scientists are now finding that having a pet may keep its owner      .  And good health may add years to a person’s life.
Scientists have been       the tie between pets and health for years. In 1990, a study was done with people aged 65 and older. It       that pet owners went to the doctor less than people   __   pets. Do pets make people      ? Are people able to handle their everyday lives better? Alan Beck, who is a researcher, says that       the answer to the questions is yes, then having pets may be a good idea.
Can pets also help people live longer? Rebecca Johnson did a study to      . Johnson teaches nurses how to care for       people. Her study shows that having pets may cause people to       more slowly.
The human body makes many chemicals. Some of the chemicals make people feel      . Others make people feel bad. In Johnson’s      , levels of the “good” chemicals       when people were around pets while levels of the “bad” chemicals went down. The good     seemed to slow the aging of cells. If this is      , maybe people should spend more time with their      . Then people might feel better and       longer.
You might be allergic（过敏的） to pets. Or you may not want to       a pet. Never fear. A robotic, or computer pet may be just the thing for you.
Scientists are testing computer pets, like the robotic dog AIBO. They want to see if       pets can help people the way       dogs do.
Will a robotic pet       the real pet sitting with you on the sofa? Something tells us that it will probably become a reality.

A．healthy B．excited C．mad D．hurried

A．carrying out B．making up C．looking at D．breaking down

A．warned B．showed C．reminded D．advised

A．through B．beyond C．against D．without

A．busier B．funnier C．happier D．angrier

A．though B．until C．if D．unless

A．find out B．put out C．turn out D．set out

A．sick B．friendly C．old D．lovely

A．age B．move C．walk D．grow

A．bored B．surprised C．sleepy D．good

A．study B．work C．story D．case

A．changed B．varied C．fell D．rose

A．sides B．chemicals C．studies D．dogs

A．important B．unusual C．true D．impossible

A．children B．pets C．friends D．neighbors

A．live B．wander C．stay D．travel

A．head for B．search for C．cheer for D．care for

A．family B．computer C．baby D．toy

A．brave B．quiet C．faithful D．real

A．destroy B．replace C．improve D．accompany