Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
| A．it, it | B．what, what |
| C．it, what | D．what, it |
—— Don’t you have a watch?
—— But it has gone wrong. They say it’s not worth ______.
| A．being required | B．to be repaired | C．of repairing | D．repairing |
This kind of work ______ great patience, so you should take your time.
| A．calls on | B．calls for | C．calls up | D．calls back |
Li Ming, as well as his parents , ____ to the party.
| A．has invited | B．was invited | C．have invited | D．were invited |
. It is said that Mr. President will hold a dinner party _____ the heroes who have won honor for the country.
| A．to praise for | B．in honour of | C．instead of | D．to celebrate |
The gardener was called to tell the way ____ the poor dog had died.
| A．that | B．which | C．in that | D．of which |