Ⅰ．单词拼写
1．Polly took a bite of the apple，chewed，and ________(吞下).
2．A ________(浴缸) is a long，usually rectangular container that you fill with water and sit in to wash your body.
3．You use “________”(上年纪的) as a polite way of saying that someone is old.
4．An ________(操作员) is a person who is employed to operate or control a machine.
5．By the time the ________(救护车) arrived he was unconscious.
【答案】1．swallowed 2．bathtub 3．elderly 4．operator 5．ambulance
