When first ____ to the market, the products enjoyed great success.
| A．introducing | B．introduce | C．introduce | D．being introducing |
By _____ chance a friend of mine came across Jay Zhou in Taiwan, who has _____ gift for music.
| A．a, a | B．a,/ | C．the, a | D．/, a |
----Can you come to the party on Saturday, Peter?
---- Oh,__________ I’m already going out, I’m afraid.
| A．cheer up! | B．what a pity! | C．why not? | D．I’d rather not. |
My son has gone abroad．I’m looking forward to him ______．
| A．return | B．to return |
| C．returning | D．returned |
_____ in the woods，the two girls were frightened and kept crying．
| A．Having lost | B．Lost |
| C．To be lost | D．Being lost |
I ______ to reach the manager for the last two hours but the line is always busy．
| A．tried | B．have tried |
| C．had tried | D．have been trying |