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

咖啡机热水阀放水时，咖啡机的（）。

A、泵压表指针下降

B、汽压表指针下降

C、泵压表指针上升

D、汽压表指针上升