教学目标：
1. Ss can master the new words and sentence structures.
New words:delicious, expensive,crowded,cheap,think of……
Sentence structures:
A:Where did you/she/he… go on vacation?
B:I/He/she went to ……
A:What did you/she/he/they do?
B: I/she/he/they cleaned my room/did homework….
A:How was /were..?
B:It was …… /They were …
2. Ss can use the sentence structures to talk about past events.
3. In order to practice ss’ listening ,speaking and writing.
