A had got, knew

b) were translated, were calculated

c) have been translated, are calculated

d) had been translated, were calculated

4. In recent years, scientific and technological developments ______human life on our planet, as well as our views both of ourselves as individuals in society and of the universe as a whole.

a) have drastically changed c) are drastically changing

b) drastically changed d) change drastically

5. Before we______from swimming in the river near the camp, someone______our clothes, and we had to walk back with our towels around us.

a) returned, stole c) were returning, stole

b) had returned, had stolen