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
I found some old pictures at the back of my drawer which _____ memories of my childhood.
A.called in B. called up
C. called back D. called off
I like the colour of the cap ______ I dislike its design.
A.while B. if C. despite D. as
It is believed that _____ European scientist invented _______.
A.an; a television B. a; a television
C. an; the television D. a; the television
