25. 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
26. I was about to tell everyone the truth ______ she turned up.
A. while B .when C. as D .till
27. The bag has lots of things in it, ______ an old dictionary.
A. containing B. showing C. holding D. including
28. He is always full of ______ as if he never knew tiredness.
A. strength B. force C. energy D. spirit
29. The experiment done by Tomlinson _______successful.
A. proves B. was proved C. is proved D. prove
