Some people believe that giving giftsis one way ____by others

Although going on your first trip to the UK is exciting, new and different customs can also be _____. Table manners are no exception.

The role of Chinese Dama in the economy has been over-estimated by some western media ______ their “gold rush” has had little influence on gold prices

Who is that young woman– She is ________ teacher. She teaches________ English.

Chemical pollution will bring about a threat toagriculture and food chain, and ________ to human health.