－The door was open.
－It ______ open. I had locked it myself and the key was in my pocket.
| A．can not be | B．must not be | C．can not have been | D．must not have been |
The black box is a necessary device on an airplane, which records its speed, direction and whether everything on the airplane______ normally.
| A．will function | B．functioned | C．is functioning | D．has functioned |
Stella was disappointed to find her new plan ______and fell into great depression.
| A．put away | B．carried out | C．turned down | D．left out |
If we can ______ our present difficulties, then everything should be all right.
| A．come across | B．get over | C．come over | D．get off |
Anyway, that evening, ______ I’ll tell you more about later, I ended up staying at Rachel’s place.
| A．when | B．where | C．what | D．which |
–Is there an express to Beijing tonight?
-- There ______be , but you’d better call the booking office to make sure.’
| A．can | B．might | C．will | D．must |