9.
preserve 保护，保藏，维持。如：Deep freezing is a good way to preserve food.
reserve 储备，预定，留作专用。如：I reserved three rooms at the hotel.
retain 保持，保留，雇用。如：She retains a good memory of her childhood.
sustain 支撑，维持，蒙受。如：The light shelf won't sustain all these books.
We'd like to a table for five for dinner this evening. (02.6)
A) preserve B) reserve C) retain D) sustain
译文：我们想预定一张今晚五人用餐的餐桌。答案是B。
10.
symbol 符号，象征。如：Red is a symbol of danger.
sign 记号，告示，迹象。如：There are signs of sorrow on her face.
signal 信号，讯号。如：The ship is sending out signals for help.
symptom 症状，表征。如：A persistent cough may be a symptom of pneumonia.
Many people like white color as it is a of purity. (02.6)
A) symbol B) sign C) signal D) symptom
译文：许多人喜欢白色，因为它象征纯洁。答案是A。
11.
valid 有效的，有充分根据的。如：The contract is valid for six months.
vain 无益的，徒然的，自负的。如：She made a vain attempt to persuade him to come
back.
vacant 空的，未被占用的，空虚的。如：He applied for a vacant position.
vague 不清楚的，含糊的，茫然的。如：I haven't the vaguest idea of what they want.
The neighborhood boys like to play basketball on that lot. (02.6)
A) valid B) vain C) vacant D) vague
译文：附近的男孩爱到那块空地上打篮球。答案是C。