A、隔离传染病患者             　　 B、易感者不接触传染源

C、消灭传播疾病的节肢动物      D、对病人用过的器具、住 过的房间进行消毒

E、加强体育锻炼              　　  F、讲究个人卫生和环境卫生

G、预防接种（如注射疫苗）     H、及时处理患传染病的动物

根据句意，用括号内所给单词的正确形式填空。（一空一词）

1.They are organizing the____  (thirty-nine) sports meeting of their school.

2.The house____ (it) is very beautiful, but the river near it is much polluted.

3.The boy's dad was ____ (complete ) shocked when he saw that his son was playing with fire.

4.The news and talk shows may not be very exciting, but we can expect ____  (learn) a lot from them.

5.My grandfather's sunny character has a great ____ (influent) on me in my life.

已知点P（a，a+2）在直线y=2x-1上，则点P关于原点的对称点P′的坐标可表示为 （　　）