The price of pork has been very（）these days.

单项选择题You must （） the rubbish before you leave the office.

A. dispose of
B. deal with
C. cope with
D. treat with

单项选择题My watch is nowhere to be found. I （）when I was on the bus.

A. must drop it
B. might drop
C. must have dropped it
D. should have dropped it.