— Why are you so popular with your students?
— As a teacher, I seldom give my students so difficult a problem ____ they cannot work out.
| A．as | B．that | C．if | D．which |
The experiment __to be .
| A．turned out; greatly success | B．turned out; a great success |
| C．turned out; greatly successful | D．turned up; great success |
Many _______ of years later, the first extremely small plants began to appear on the surface of the water.
| A．millions | B．million | C．million of | D．millions of |
As a child, Franc ＿＿＿＿＿.
| A．was alive | B．grew patience | C．ran wild | D．came true |
They won’t buy any new clothes because they ________ money to buy a new car.
| A．save | B．were saving | C．have saved | D．are saving |
Jenny worked hard before the final examination, and it _______ ．She got an A．
A．showed off B．paid off C．put off D．took off