If you are traveling ________ the customs are really foreign to your own，please do as the Romans do.
| A．in which | B．what | C．when | D．where |
Wang Jing is sitting __ my right.
| A．in | B．on | C．beside | D．at |
Little Jim sat under the tree, ___ about that maths problem.
| A．to think | B．and thinks | C．thought | D．thinking |
More than 70 percent of the playground in our school __ covered by water now.
| A．are | B．is | C．were | D．be |
Shanghai is __ the east of Nanjing.
| A．in | B．to | C．from | D．om |
The Great Wall took _ a new look after the People\s Republic of China was founded.
| A．for | B．on | C．in | D．at |