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Basic science
Date processing
Sustain the ecological system
Inventions and discoveries
Maintain the rate of progress
2 Choose the write variant:
   1 the least expensive - b
   2 the fastest - c
   3 a lot better - b 
   4 comfortable - c
   5 the smarter -b 

           3  
1- a
2- a
3- a/b
4- b
            4
1 turning
2 to get
3 staying
4 to read
5 telling
6 visiting
              5
1 had done
2 phoned
3 had written........had gone
4 buys
5 wouldn't have got