They experimented _____the new medicine _____animals．
A．on; to B by ; on C．with ; on D with; to
Children under six are not ______to school except those of extraordinary intelligence．
A．permitted B．admitted C accepted D．received
three times，but she still couldn’t follow what the old man said．
A．Having told B．Having been told
C．She had been told D．Though he had been told
一 Mom, guess what? I’ve won the 1st prize!
一 This a celebration! Let’s go to prepare a party．
A．helps out B．works out
C．calls for D．pays for
A reward of 1,000 dollars will be given _______can find the lost child．
A．whomever B．whoever that C．to whomever D．to whoever
is known to us all is that the old scientist, for life was hard in the past, still works very hard in his eighties．
A．As; whom B．What; whom
C．It; whose D．As; whose
