A successful scientist needs _____ if he wants to make hypothesis (假设) of how processes work and how events take place.
This custom the seventeenth century.
If you had got up early,you here on time.
The highway to the city is under repair now.
It has been suggested that the land equally among the farmers.
Although James Cook the first westerner to have discovered Australia,New Zealand and Hawaii,his travels led to the creation of more accurate and reliable maps for vast parts of the world.