.- The light in the office is still on.
-Oh ,I forget____.
| A．turning it off | B．turn it off | C．to turn it off | D．having turned it off |
The experiment done by Tomlinson _______successful.
| A．proves | B．was proved | C．is proved | D．prove |
He is always full of ______ as if he never knew tiredness.
| A．strength | B．force | C．energy | D．spirit |
The bag has lots of things in it, ______ an old dictionary.
| A．containing | B．showing | C．holding | D．including |
I was about to tell everyone the truth ______ she turned up.
| A．while | B．when | C．as | D．till |
Helen is on time for everything. How ______ it be that she was late for such an important interview?
| A．might | B．can | C．must | D．may |