. 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 |
---Is Sarah coming ?
--- No. She should have let us know earlier , but _______ she has been very busy recently.
| A．to be sure | B．to be honest | C．to be fair | D．to be exact |
We passed through some beautiful _______ on our journey through the Lake District.
| A．view | B．scenery | C．sight | D．scene |
It was _______ you had done _______ made it possible for you to improve your English.
| A．that ; that | B．that;what | C．what; what | D．what;that |
Your friends were all worried about _______ you were sick.
| A．that | B．which | C．what | D．the fact that |
--Thank God you are safe!
---I stepped back , just _________ to avoid the racing car.
| A．in need | B．in case | C．in time | D．in turn |