The roots of plants help to (5) ______ the rocks and soil in place. Water that falls on grasslands runs away more slowly than water that falls on bare ground.

I wanted to use my time well, so I had planned a route which would include several small islands and various parts of the countryside. In my (3) ________, a person travelling alone sometimes meets with unexpected hospitality, and this trip was no (4) ________.

Last year, there were millions of international tourist arrivals across the globe. Whether they were students on their (1)______ years looking for overseas adventure, stressed-out workers hoping to get away for a weekend, or retirees (2)_______ to relax in an exotic locationclearly none of them thought they could find the same experience at home. The question is whether foreign travel brings more advantages or disadvantages. An obvious positive point is that going abroad sometimes helps people to expand their knowledge of the world. If they are (4)_____ minded, they can learn about new cultures and hopefully gain a more accurate understanding about their way of life. In addition, there is the economic benefit of tourism to countries which have few other resources. It can provide an income to many people within the industry. Having said that, some people simply go to a
foreign resort (4)______ by high walls and therefore learn little about their holiday (5)_______ . Another issue is that hordes of tourists often spoil the “unspoilt” places they visit. The most recent example of this is Antarctica, where last year cruise ships took thousands of visitors to view the disappearing icebergs and wildlife. Vegetation, nesting penguins and resting walrus are vulnerable when humans intrude.

The most successful animals on earth - human beings - will soon be the only ones (5)________, unless we can solve this problem.

At meeting, it’s important to follow the agenda and not interrupt (3)______ speaker.

(4)_______ , it is not possible to do this on a large enough scale to save all the lakes. Car exhaust fumes contain carbon monoxide and lead which are highly poisonous.

After doing various jobs to raise some money, he left home to gain some experience of life in different cultures, visiting America and Asia. The more adventurous the young person, the (2)_____ the challenge they are likely to set themselves for the gap year, and for some, like Nigel, it can result in a thirst for adventure.

Fireworks are set off and everyone enjoys the display as they stand round the fire (5)          warm and eating baked potatoes and hot dogs.

If a business colleague comes closer than 1.2 meters, the most common response is to move (3)_____

Some interesting (4)_____ have been done in libraries. If strangers come too close, many people get up and leave the building; others use different methods such as turning their back on the intruder. Living in cities has made people develop new skills for dealing with situations where they are very close to strangers. Most people on crowded trains try not to look at strangers; they avoid skin contact, and apologize if hands touch by mistake.

It works like a greenhouse, that’s why we call (3)______ the Green House effect. Because of this effect, the Earth is getting warmer all the time.