____ our natural resources is very necessary.
Everyone knows that ______ paper was invented by _______ Chinese.
The policeman’s ________ traffic directions made all the drivers quite _________.
If I have a short-wave radio, I can often __________ the BBC programmes.
We have raised some money and heavy clothes for the survivors in the earthquake________ they can go through the coming winter safely.
—How do you find the cards I’ve collected recently? —Very nice, especially ________bearing the signature of Liu Xiang.