The number of people in the world__________ about 6 billion and large quantities of waste ____ each year.
There is a ________ cup on the table.
The boy went swimming in the deep lake,________ his mother’s fear for his safety.
—What’s the price of petrol these days?—It ________ frequently since last year.
Hardly ________ when the flood peak arrived.
—$100,but that is my last offer.—________