. China has hundreds of islands, _____ is Taiwan.
| A．the largest of which | B．of which largest |
| C．which the largest | D．in which the largest |
He plays well or badly according to his mood (心情), so he’s a very _________ player.
| A．modest | B．easygoing | C．temperamental | D．calm |
No one knows exactly ______ this important discovery was made.
| A．that | B．that how | C．what | D．when |
The weather turned out to be very good, _______ was more than we could expect.
| A．what | B．which | C．that | D．it |
I don't really work here；I _______ until the new secretary arrives.
| A．just help out | B．have just helped out | C．am just helping out | D．will just help out |
-- How about putting some pictures into the report?
--________ A picture is worth more than a thousand words.
| A．No way. | B．Why not? | C．That’s all right. | D．It doesn’t matter. |