As we all know, future __________ the well-educated.
| A．is belonging to | B．was belonging to |
| C．is belonged to | D．belongs to |
Not until the early years of the 19th century______ what heat is.
| A．man did know | B．man knew | C．didn’t man know | D．did man know |
_____ he realized it was too late to return home.
| A．No sooner it grew dark than | B．Hardly did it grow dark when |
| C．It was not until dark that | D．It was until dark that |
So little _____ agree on the plan that they could not settle their difference.
| A．did they | B．do they | C．they did | D．they did not |
We were lucky enough， for no sooner _____ home _____ it rained.
| A．we returned， and | B．we had returned， when |
| C．did we return， when | D．had we returned， than |
____， he would have passed the exam.
| A．If he were to study | B．If he studied hard |
| C．Had he studied hard | D．Should he study hard |