Сгруппируйте синонимы
1research field
2branch use
3various absolutely necessary
4application investigation
5indispensable different
6curious complicated,sophisticated
7complex level

1to introduce to assist
2to carry out to avert,to ward off
3to prevent to apply
4to help to perform,to execute


Ответы и объяснения

1 investigation, 2 use, 3 different, 4 level, 5  necessary, 6 complicated,sophisticated, 7 field.
1        to apply
2       to perform,to execute  
3        to avert,to ward off
4       to assist