Mr Black decided to give up his farm and devote all his time to______ those children living on the streets.

The driver stopped the car      a cat      across the street.

    great help, I could get rid of all the difficulty and succeeded in the end．

________ deep down in the earth for thousands of years, the dead forest has rotted away and become coal．

.How many of us ____ a meeting that has nothing to do with us is not important at all.