The fact has worried many scientists ________the earth is becoming warmer and warmer these years

The world’s population is getting largerand larger, so scientists will have to ______ new ways to solve food problem.

Out of sympathy for the earthquake victims in Yushu, the kind-hearted lady ____ her clothes and quilts to them.

Our teacher often gives us some about English.

Jam Hsiao, a singer from Taiwan, understands that it is his singing, rather than his talking, ______ has got him to where he is now.