In order to jump, your body changes the chemical energy ________ in the food you have eaten into mechanical energy.
A．being stored B．storing
C．stored D．having been stored
With all the books he was interested in ________， he left the library and went back to his dorm.
A．borrowed B．borrowing
C．to borrow D．borrow
They suggested that the professor ________ just now ________ chairman of the meeting.
A．referring to；was made B．referring to；be made
C．referred to；be made D．referred to；was made
—Can you introduce me a high quality machine?
—My pleasure. ________ well even on wet roads, this kind of car is very popular.
A．Handled B．To handle
C．Handling D．Being handled
The April Fools' tradition is said ________ in the sixteenth century.
A．to start B．to be starting
C．to be started D．to have started
It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.
A．produced B．producing
C．to produce D．having produced
