As we know, fresh air and proper amounts of exercise can____ good health.
| A．link to | B．contribute to |
| C．depend on | D．concentrate on |
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 |
After her son died in a car accident, the old lady would sit at the window, ______ out and _______ in thought.
| A．looked; lost | B．looking; losing |
| C．looked; losing | D．looking; lost |