Along with the letter was his promise ___ he was free he would visit me the coming month.
| A．what | B．that | C．that if | D．whether |
As the day was fine, I made the suggestion ________ for a walk in the park.
| A．we go | B．we will go | C．should we go | D．that we go |
________ 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 |