________ the program，they have to stay there for another two weeks.
A．Not completing B．Not completed
C．Not having completed D．Having not completed
The news of ________ greatly made us surprised a lot as he was indeed very excellent.
A．not his having elected B．not his being elected
C．his not being elected D．his not having elected
—They are quiet，aren't they?
—Yes.They are accustomed ________ at meals.
A．to talk B．to not talk
C．to talking D．to not talking
________ the meeting himself gave them a great deal of encouragement.
A．The president will attend
B．The president to attend
C．The president attended
D．The president's attending
The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.
A．causing B．being caused
C．to be caused D．to have caused
—Is Bob still performing?
—I'm afraid not.He is said ________ the stage already as he has become an official.
A．to have left B．to leave
C．to have been left D．to be left
