With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ________.
One learns a language by making mistakes and_________them .
.I will do what I can_________ the people in trouble .
The teacher told us that water_________at 100℃ .
.It was three o’clock_________we finished the work .
—Which do you like , tea or coffee ? —_____________.