Concern – concerned / award – awarded / economic – economically / import – importer / negotiations – negotiator / construct – construction / environment – environmentalists / loans – loaned / fuel – fuels / pollute – pollution
11 make final attempt to stop pipeline project
12 Principal is environment says world leaders
13 Billion dollar contract to foreign consortium
14 Industrial plant accused of water
15 Protestors attack project in jungle
16 More aid for less developed countries
17 criticise new tax on shipments from overseas
18 Government call off with green peace over rainforest
19 More protests support for president’s resignation
20 US cancels interest on all to Africa

The rapid development of technologies makes the diverse educational mode come true. an increasing number of universities have opened up distance education in many countries at present. at the same time, hundreds of millions of people will benefit from the emergence of brand-new educational mode. from my perspective, i stand on the side of the view that the positive development from distance learning outweighs its negative effect.there is a common recognition that high quality of education should be available for all to enjoy, not just confined to the rich students. take studying abroad as an example, before appearing distance learning, poor students have no chance to take part in further education abroad because of shortage of money. however, now these students can gain the same quality knowledge by spending less tuition. in addition, distance learning is not restricted to special targets and places. the schedule of distance learning is flexibility so that workers can have classes on their leisure time, which cannot affect workers’ daily work, more important thing is both students and workers can choose study places wherever they want. furthermore, schools will save plenty of expenditure on classroom to improve teacher quality.however, there are certainly shortcomings on distance learning. to begin with, taking traditional classes, we can acquire a variety of opinion on group discussion while distance learning is considerably hard to carry out discussion classes with other overseas students. in the second place, distance learning is unable to use without internet. if we suffer from enormous disaster like earthquake or tornado that makes our internet break off, our learning had to halt until the internet recover.in conclusion  , as a  coin has two sides, distance learning without exception. distance learning is not only to make universal education possible but also to promote international exchanges.

I have cleaned the car. Doesn`t it look nice?
"You look tired". "I have been washing clother all day".
It has been snowing all day. I wonter when it stops.
We have had three major snowstorms so far this winter. I wonter how many more we will have.
The man has been standing outsde for hours.
The castle has stood on that hill for 900 years.
Ann has been gardening all afternoon. She has planted a lot of rose bushes.

They have still  been fishing.
Has he done his lessons yet?
She hasn't read this book, yet.
My sister has already been studying music for five years.
Have they been playing volley ball since 3 o'clock?
They have already written the letter.
Has your father already come from work?