(1). Earth is the name of the planet on which we (C) live.
(2). It is a huge ball of rock (B) spinning through space.
(3). No one is sure when earth (A) began, but some scientists think that, between 10 and 20 billion years ago,
(4) there (A) was a huge explosion,
(5) (D) has called the big bang.
(6). Gradually, over millions of years, stars and planets (A) have started to form.
One of these planets was Earth.
Объяснение:
A В C D
1 are living lived live have lived
2 spin spinning span is spinning
3 began begins begin begun
4 was were have been is
5 calling was called called has called
6 have started started was started starts
1. It is not a difficult matter to give a simple answer to the basic question.
It was not difficult matter to give a simple answer to the basic question.
It will not be difficult matter to give a simple answer to the basic question.
2. People apply their knowledge and efforts to the gifts of nature in order to satisfy their material wants.
People applied their knowledge and efforted to the gifts of nature in order to satisfy their material wants.
People will apply their knowledge and will effort to the gifts of nature in order to satisfy their material wants.
3. Even in the prosperous countries there is an aspect of survival.
Even in the prosperous countries there was an aspect of survival.
Even in the prosperous countries there will be an aspect of survival.
4. This problem attracts little attention.
This problem attracted little attention.
This problem will attract little attention.
5. Such people have the abilities to sustain life without outside assistance.
Such people had the abilities to sustain life without outside assistance.
Such people will have the abilities to sustain life without outside assistance.
6. They experience great poverty.
They experienced great poverty.
They will experience great poverty.
7. They depend on the efforts and cooperation of many thousands of specialist workers.
They depended on the efforts and cooperation of many thousands of specialist workers.
They depend on the efforts and cooperation of many thousands of specialist workers.
They depend on the efforts and cooperation of many thousands of specialist workers.
Объяснение:
They will depend on the efforts and cooperation of many thousands of specialist workers.
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