The salesman approached the house cautiously because of the vicious dog.（）

单项选择题They met to consider the drawbacks in the proposal.（）

A．misgivings
B．shortcomings
C．probabilities
D．details

单项选择题The manufactures hoped that the motor show would boost their car sales.（）

A．add
B．promote
C．lift
D．prompt

单项选择题It seems that concentrations of salt cause changes in the colour of sea water.（）

A．fluctuations
B．deviation
C．modifications
D．variations

单项选择题The clerk had to break off the conversation in order to wait on a customer.（）

A．continue
B．stop
C．hurry
D．begin

单项选择题When they asked me to make a speech，I was at a loss for words.（）

A．elated
B．dumb
C．surprised
D．tonguetied

单项选择题The gift was from an anonymous person.（）

A．ignored
B．unremembered
C．unrewarded
D．unnamed

单项选择题John boasted that he could finish the job all by himself in no time.（）

A．very rapidly
B．in time
C．on time
D．at any moment

单项选择题It is imperative for the Chairman to look into this master personally.（）

A．necessary
B．urgent
C．useful
D．impossible

单项选择题“I really think there must be something rather fishy somewhere,don't you”（）

A．smelling of fish
B．tasting of fish
C．suspicious
D．delicious