Cigarettes and alcohol do such ________ great harm to health that they can easily cause ________ weakening of our bodies.
| A．a; / | B．/; the | C．a; the | D．/; / |
.The wet weather will continue tomorrow, when a cold front ______ to arrive.
| A．is expected | B．is expecting |
| C．expects | D．will be expected |
.— This is one of the oldest trees in the world.
—_____ such a big tree.
| A．Never I have seen | B．I haven't never seen |
| C．Never have I seen | D．I have seen never |
.When he was a boy, he used to go there and watch _____.
| A．to repair bicycles | B．bicycles to be repaired |
| C．bicycles being repaired | D．repairing bicycles |
Meeting my uncle after all these years was an unforgettable moment, _____ I will always treasure.
| A．that | B．one | C．it | D．what |
.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 |