I must apologize for ________ ahead of time.

　　A．letting you not to know

　　B．not letting you know

　　C．letting you know not

　　D．letting you not know

________ full preparations, we decided to put off the meeting till next week.

　　A．We had not made

　　B．Having not made

　　C．We did not make

　　D．Not having made

He must be angry, for we heard the glass ________ on the floor.

　　A．being broken

　　B．break

　　C．broken

　　D．to be broken

________hardly made Allan pay any attention to ________ his mistakes.

　　A．Scolding, correcting

　　B．Being scolded, correct

　　C．Being scolded, correcting

　　D．Having been scolded, correct

—Was the lecture successful?

—Yes, but the number of ________ was smaller than we had expected.

　　A．people attended it

　　B．attended people

　　C．people attending it

　　D．attendance of people

—Did you have a good time at the party?

—Thanks. I appreciated ________ to your home.

　　A．to be invited

　　B．to have invited

　　C．being invited

　　D．having invited

—How do you think Mary managed to improve her French in such a short time?

—________ 4 hours on it every day.

　　A．Because of spending

　　B．By spending

　　C．Spent

　　D．To spend

________ to nuclear radiation, even for a short time, may produce variants（变异体）of genes in human bodies.

　　A．Being exposed

　　B．Having exposed

　　C．Exposed

　　D．After being exposed

He is not easy to get along with, but the friendship of his, ________, will last forever.

　　A．once gained

　　B．to be gained

　　C．after gained

　　D．while gaining

________ at failing in the math exam, John wouldn’t like to talk about it to his parents.

　　A．Disappointed

　　B．To be disappointed

　　C．Disappointing

　　D．Having disappointed