Bamboo is ___ grass, but not tree.
| A．a type of | B．a pile of | C．a kind of | D．a piece of |
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Please don’t bother me again. I’ll inform you of the details at a/an time if you must know.
| A．appropriate | B．convenient | C．acceptable | D．accessible |
I just don’t understand 
that leads to so many teenagers addicted to playing computer games.
| A．why it is | B．what it is | C．what it does | D．why it does |
These problems may lead to more serious ones, if unsolved.
| A．remained | B．keeping | C．left | D．making |
His efforts to raise money for his program were ____ because no one showed any intention to take a cent out of their pockets.
| A．in place | B．in sight | C．in effect | D．in vain. |
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