The policeman told us __________ the street when the traffic light was red.
| A．not cross | B．didn’t cross |
| C．not crossing | D．not to cross |
- He________ if he is free.
| A．will come | B．comes | C．come | D．Came |
—What was Tom doing _______ it was raining?
—He was doing his homework in the bedroom.
| A．since | B．while | C．for | D．who |
Some scientists believe that theremore robots in the future.
A will have B. will has
C. will beD. Are
They ________ TV at ten o’clock last night.
| A．was watching | B．were watching |
| C．watched | D．Watches |
It will be difficult ________ a robot_________ same things as a person，
| A．of， do | B．for， to do |
| C．for， doing | D．for， do |