Ⅰ.用所给词的适当形式填空
1．You must have your luggage ________ (weigh) at the airport.
2．After __________ (measure) the room，I found it was twenty feet wide and thirty feet long.
3．It’s dangerous to carry a hot pan with ________ (burn) oil.
4．They said they ____________ (open) a western food restaurant on Beijing Road the next month.
5．His mother’s death ____________ (cause) by the heart disease.
