Not until actually ________ with water shortage ________ appreciate the value of water to a region.
Wang Jing is sitting __ my right.
Little Jim sat under the tree, ___ about that maths problem.
More than 70 percent of the playground in our school __ covered by water now.
Shanghai is __ the east of Nanjing.
The Great Wall took _ a new look after the People\s Republic of China was founded.