"The lecturer was a tall thin man with white hair." "Then it _______Dr.Fell because he is short and fat.It_____Dr.Jones;he is thin."

Itisimperativethatyou____hereintime.

The aeroplane ____ she was traveling was delayed for three hours at least.

Washerisamachine____(用它我们洗衣服)orapersonwhoiswashing.

The doctor ____ is leaving for Africa next month.