His sister left home in 1998, and ____________ since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
Most senior high school students are working hard day and night to pass the college entrance examination, gaining ____ to a university.
| A．application | B．connection | C．admission | D．agreement |
____ difficult the work may be, we must go all out to finish it ahead of time.
| A．Whatever | B．However | C．How | D．What |
What worried the child most was ____ to visit his mother in the hospital.
| A．his not allowing | B．his not being allowed |
| C．his being not allowed | D．having not been allowed |
The baby cried again. The young mother felt very ____ and her husband wore ____ expression on his face, too.
| A．confused; confused | B．confusing; confused |
| C．confusing; confusing | D．confused; confusing |
There is ____ Mr. Smith at the door who wants to speak to you.
| A．a some | B．certain | C．some a | D．a certain |