脉冲多普勒检测卵巢恶性肿瘤流速曲线特点多为（）

A.中速中阻

B.高速高阻

C.低速高阻

D.低速低阻

E.高速低阻

请根据句意从方框中选择合适的动词，并用其适当时态填空，使句子通顺。

小题1:Williams    ▲   his students a wonderful speech on Manners last Wednesday.

小题2:The Greens and the Browns    ▲   next door to each other for many years.

小题3:Lucy    ▲    for London on business in three days.

小题4:—Were you at school when he came to see you?

—Yes, I    ▲   a math class.

小题5:Betty will ring me up when she    ▲   in Beijing.