The father along with his children ______ solving word puzzles. 

According to the recent regulation, it is required that any chemical plant that_______ along the river _______ to build a recycling center for the waste.

The population of China___ to many times what it was in 1949, and most of its population ___ farmers.

____of the land in that district ____covered with trees and grass.

There _______plenty of milk in the fridge.