It is difficult to between Mary and her younger sister
A．decide B．distinguish C．explore D．express
You have done so much that you are pass the exam．
A．bound to B．turn to C．adjust to D．object to
The fact has worried many scientists the earth is becoming warmer and wormer．
A．what B．that C．though D．which
Do you still remember the rider and his new bike we saw in the street last week?
A．which B．who C．that D．whom
Tony the fact that he had made a mistake．
A．accounted B．permitted C．allowed D．acknowledged
But for her help，we the task in time．
A．will not finish B．had not finished
C．can not finish D．could not have finished
