Not until I began to work ____ how much time I had wasted.
| A．didn't I realize | B．did I realize | C．I didn't realize | D．I realized |
17. They don’t think advertisements are useful for our daily life, .
| A．aren’t they | B．are they | C．don’t they | D．do they |
16. He hasn’t come yet. What do you think__________to him?
| A．happens | B．has happened | C．happening | D．to happen |
15. The teacher spoke____of Tom, because he is the only student who can fly the kite
in the sky.
| A．high; highly | B．highly; highly | C．high; high | D．highly; high |
14. All the electrical equipment_____will be equipped in the officegreat importance to us.
| A．that; are of | B．that; is of | C．what; is of | D．what; are of |
13. Would you please tell me the quickest way_______English well?
| A．to learn | B．of learning | C．how to learn | D．A or B |