It is sleeping late in the morning that ______being late for work.
| A．devotes to | B．sticks to | C．refers to | D．leads to |
.Three-fourths of the buildings ______.
| A．was destroyed | B．is destroyed | C．were destroyed | D．has been destroyed |
.Early to bed and early to rise ______ a man healthy, happy and wise.
| A．making | B．to make | C．make | D．Makes |
.Mathematics ______ the language of science.
| A．is | B．has been | C．are | D．have been |
.The young ______ the vital forces in our society.
| A．is | B．has been | C．are | D．have been |
.Every man, woman and child ______ some history, enough at least, to survive in the world.
| A．knows | B．know | C．is known | D．are known |