The greatest love in the world is no doubt the love of a mother; it can be _____ by nothing else.
19. I don’t know why he blamed the accident _____ me.
18. The dying man is _____ the help of the doctor.
17. Hunan lies _____ such provinces as Hubei, Jiangxi, Guangdong, Guizhou and Chongqin.
16. Mary answered all the questions _____ the last one, which she had never heard of before.
15. The doctor bent _____ the boy and checked his wound.