Kangkang is good _____ running. He thinks it is good _____his health.[ ]

What’s _____most useful invention in the 20th century? —_____ computer, I think.

He intends to apply for _______ permit from the government to export goods of ______ high quality to Russia.

Thank you _____ your flowers. [ ]

“It is commonly believed that women love to chat. But, ________, men chat more than women do.”, says a new study.