John received an invitation to dinner，and with his work ________，he gladly accepted it.

A．finished  B．finishing

C．having finished  D．was finished

—Come on，please give me some ideas about the project.

—Sorry.With so much work ________ my mind，I almost break down.

A．filled   B．filling  C．to fill   D．being filled

The children went home from the grammar school，their lessons ________ for the day.

A．finishing  B．finished

C．had finished  D．were finished

The country has already sent up three unmanned spacecraft，the most recent ________ at the end of last March.

A．has been launched  B．having been launched

C．being launched   D．to be launched

________ 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