The enemy troop could hardly make any advance, and ________ could they fall back.
| A．neither | B．so | C．either | D．both |
Can you find a sentence situation _______ this phrase can be used?
A. where B
. when C. which D. that
Trust him please! When he _______ reading it, he will return the book to you on time.
| A．finish | B．will finish | C．has finished | D．finished |
He is my father and I know he will forgive me for _______ I have done.
| A．whatever | B．no matter what | C．no matter how | D．whichever |
Charles is believed_______ the floor yesterday; he is always helping others silently.
| A．to sweep | B．to have swept | C．having swept | D．swept |
The _____ of electricity added to our difficulty repairing the bridge.
| A．absence | B．short | C．need | D．break |