The world’s population has grown _____ it was in 1800.
-Hurry up! We still have 30 miles to __________ before dark.-OK. I will make every effort not to fall behind.
In autumn, it's beautiful outside with golden fallen leaves __________ the ground.
-Would she mind playing against her former teammates?-__________ She is willing to play against any tough players.
Mr. Smith is __________ to attend the party to be held next Wednesday.
People who are often with smokers are __________ to suffer from lung cancer than those who are not.