—Will you go fishing with me?
—___________.
| A．No, I'll be very busy | B．Yes, I'll be glad |
| C．Certainly, I'll be sorry | D．Certainly, I'll be glad to |
Time should be made good use of ____ our lessons well.
| A．learning | B．learned | C．to learn | D．having learned |
---What do you think made the woman so upset？
--- _____ weight.
| A．As she put on | B．Put on |
| C．Putting on | D．Because of putting on |
The research is so designed that once ____ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
______ in thought, he almost ran into the car in front of him.
| A．Losing | B．Having lost | C．Lost | D．To lose |
Not only ____ the jewelry she ____ been sold for her son's gambling debts but also her house．
| A．is；has | B．has；had | C．has；has | D．／；has |