Найдите герундий, в какой форме он используется: 1)the teacher insists on carrying out this experiment in our laboratory 2) upon carrying out a number of expe-riments our students solved many interesting problems. 3) by using this law we define a unit change of electricity. 4) heating the wire from 0 ̊ to 100 ̊ in-creases its resistance approximately by 40 %