小题1:  There are some people in the park.(改为一般疑问句并作否定回答)

---______ there ______ people in the park?

---No, _______ ________.

小题2:   The post office is on Center Street. (划线部分提问)

_______ the post office?

小题3:  He likes pandas.(用giraffes变为选择疑问句)

______ he like pandas _____ giraffes?

小题4:  My history teacher speaks English. (划线部分提问)

______ ______ ______ your history teacher speak?

影响切削力的主要因素有工件材料、刀具角度、切削用量和（）条件。