These problems, ________, will seriously affect the growth of teenagers and even the nation’s future.
| A．not if solved properly | B．if solved properly |
| C．if not solved properly | D．not if properly solved |
¾ Mum, I don’t know whether I should take a computer course at weekends or not.
¾ I leave _______ to your own judgment.
| A．it | B．what | C．this | D．that |
Something _______ wrong with the machine, and it _______ not work.
| A．being; could | B．going; should | C．were; might | D．went; would |
Today everyone arrived earlier than _______.
| A．expecting | B．having expecting | C．to expect | D．expected[来源 |
Just as the experts _______ it, this kind of material is not natural, but man-made.
| A．get | B．put | C．make | D．mean |
¾ Are you waiting for a bus from Medical University?
¾ Yes. I arrived here at the bus stop ten minutes ago, but the bus _______.
| A．hadn’t come | B．won’t come | C．didn’t come | D．hasn’t come |