21. Every minute should he made full use of_______our lessons. ?
| A．studying | B．to study | C．study | D．being studied? |
With drink and food ____, the prisoner had to walk out of the cave where he was hiding.
| A．run out | B．run out of | C．running out | D．running out of |
That’s such a well-known place______everyone wants to visit______ we can find it in the map of the world.
| A．that, as | B．as, as | C．that, that | D．as, that |
31. The Tower of London is _____ the Church tower.
| A．twice high than | B．two times as high as |
| C．twice higher as | D．three times the height of |
You can hardly imagine the difficulty the woman had _____ her children.
| A．taking up | B．turning up | C．bringing up | D．pulling up |
Our class is made up of 54 students, _____ are girls.
| A．of which two-fifths | B．of whom two-fifths |
| C．two-fifth of which | D．two-fifth of whom |