It is difficult for you to ______ what will happen in space without gravity.
The young designers many fresh ideas at the meeting.
--- What do you think of the plan ____ at the meeting? --- Very good. But the most important is to put it into ______.
The taxi had to because the traffic light turned red.
When he ,he couldn’t, for a moment, recognize his surroundings.
Before testing this method on patients, Dr. Baker had tests for two yearson three hundred dogs.