He spends a lot of time ___ the TV set.
We are kept ______ of what is happening in the world by reading newspapers and watching TV.
The time and effort he has devoted during the past few years _____ trees in that village are now considered to be very important.
— So you have met Maria?— Yes, it was last week ______ we attended Jack’s party.
Now that their parents are dead, the poor boy doesn’t know ________ the money they left.
It is said that the World Golf Championships (世界高尔夫球锦标赛) to be held in Shanghai will be ______ on TV.