They needed to invest in __ if the owners of all-electric cars wanted to reduce time to charge.
None of us ____ (预料到他会出现) at the party. We thought he was still in hospital.
According to many doctors and nutritionists, our maximum daily calorie intake of fat calories is ______.
How long did the journey take from England to India in the old days?
What was used to carry most mail after the colonies became a nation?
The writer believes that the rhythm of our footsteps changes as__