2. А:Have you ever stayed...
B: Yes, I have. I have stayed... 3.A:Have you ever met...B:No, I haven't...I have never met...4. A: Has Tom ever visited...? B: Yes, he has. He has visited... 5. A: Has Ann ever been..B: No, she hasn't. She has never been in...She has never been..
Science has invented a lot of interesting and useful. From biomaterials to artificial hands. From artificial kidneys to contact lenses that train the eye muscles night. From high-speed aircraft to high-speed trains that save time. From digital libraries, online universities and courses to advanced settings deep drilling of earth's crust. Modern technology should serve mankind, to help him to reach even greater heights.
However, not all technologies are for the benefit of man. Often the opposite is true. For example, modern weapons are capable of destroying both nature and human life in frightening proportions. Industry smokes, smokes, dumps toxic waste into the water intrudes into the earth's depths in search of resources. And plastic waste has already become a byword, they do not decompose naturally and are laid in nature for a long time. The Pacific already located a new "continent" of floating debris.
Now before modern technology, the challenge is to find effective ways of cleansing the environment, recycling. We also need to develop alternative sources of energy because oil, gas and coal are exhaustible in the world. But they built the world economy. Soon still have to find a replacement.
Technology created by talented people can benefit, and may harm. Depending on how to use them. With a smartphone, for example, you can breed gossip. You can not get out days of computer shooters. Each technology should be used wisely and understanding its present use.
Ответ:
Объяснение:
1) The weather has been rainy for the whole month.
The weather has not been rainy for the whole month.
Has the weather been rainy for the whole month?
2) They have moved in.
They have not moved in.
Have they moved in?
3) We have had our lunch.
We have not had our lunch.
Have we had our lunch?
4) He has been to London.
He has not been to London.
Has he been to London?
5) The train has left.
The train has not left.
Has the train left?
You received a letter from Dave, in which he writes that he recently celebrated his birthday