He is a success as a leader but he hasn’t ________ in teaching.
The experiment done by Tomlinson _______successful.
He is always full of ______ as if he never knew tiredness.
The bag has lots of things in it, ______ an old dictionary.
I was about to tell everyone the truth ______ she turned up.
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