____  in the queue for half an hour, the old man suddenly  realized he had left the cheque in the car.   [ ]

A. Waiting                   

B. To wait  

C. Having waited              

D. To have waited

在月经期避免过度劳累是为了避免（）

A.疲劳过度

B.睡眠不安

C.食欲不振

D.腰酸腿痛

E.盆腔充血