Elephants have their own way to tell the shape of an object and ________ it is rough or smooth.
Unemployment in the USA is likely to remain high in 2011,and ________ for the next few years.
What disappointed us is not what he did in class but ________.
A lot of people here,________,Tom,are for the plan that we will go to the beach on foot.
Today,________ rapid transportation and communication,the whole world seems to be smaller.
—Some Chinese students find it difficult to understand native speakers when in London.—Exactly,________ they've learned a lot about grammar and known many words.