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
Under the environment of fierce competition, the only way John could imagine ________ stress was to get tougher by making greater efforts.
A．handling B．to handle
C．handled D．having handled
________ with conducting an interview by QQ online, a facetoface interview in person can provide people with more reliable details.
A．Comparing B．Compared
C．To compare D．Compare
________ the instructions very carefully when filling in the form.
A．Following B．To follow
C．Follow D．Followed
________ her leg the last time, Brenda decided not to go on the school skiing trip this year.
A．Breaking B．Broken
C．To break D．Having broken
