Verb Tenses

Question 1

If we ______ a practical point of view, an important property of the rays are the physiological effects on human cells

Accepted Answer

take

Question 2

The conditions of its discovery were somewhat peculiar, and so it is always of interest ______ them and to explain them.

Accepted Answer

to remember

Question 3

The scientific history of radium ______ beautiful.

Accepted Answer

is

Question 4

Then I ______ that there should be in the minerals an unknown element with a greater radioactivity than uranium.

Accepted Answer

thought

Question 5

I wanted ______ if there were other elements, giving out rays of the same kind.

Accepted Answer

to know

Question 6

It has been proved that the radioactive elements are constantly ______ .

Accepted Answer

disintegrating

Question 7

Professor Curie worked in the laboratory of the school of Physics & Chemistry where Professor Curie ______ his lectures

Accepted Answer

held

Question 8

Other radioactive elements ______ since: actinium, radiothorium and mesothorium, ionium, etc.

Accepted Answer

have been discovered

Question 9

All the elements ______ such radiation I have termed radioactive.

Accepted Answer

emitting

Question 10

In chemical terms radium ______ little from barium.

Accepted Answer

differs

Questions 10