Only ________ according to the directions can the medicine be quite effective.
| A．taking | B．taken |
| C．being taken | D．having been taken |
________ the boy didn't take medicine made his mother angry.
| A．That | B．What | C．How | D．Which |
________ is to do good all one's life and never do anything bad.
| A．Whichever is hard | B．No matter what is hard |
| C．What is hard | D．All what is hard |
They would have fixed the telephone yesterday _________ it was a holiday.
| A．except | B．except for | C．except that | D．but for |
It's uncertain ________ the experiment is worth doing.
| A．if | B．that | C．whether | D．how |
Do you know ________ he expects will give us a talk
| A．who | B．whom | C．that | D．whose |