21.In 1778, Banks was elected_____president of the Royal Society,____position he held for 42 years.
A. the; the B. /; a C. a; a D. /; the
22．1 want to buy that kind of cloth because I have been told the cloth———well．
A．wash B．washes C．washed D．is washed
23._________in The darkness that she dared not move an inch．
A．She was frightened so B．So frightened she was
C．So frightened was she D．So she was frightened
