_____, he cannot solve the word puzzle.
| A．Hard although he tried |
| B．He tried hard although |
| C．However hard he tried |
| D．As he tried hard |
一I think I saw Mr. Smith at yesterday's party.
一He＿＿there. He is now on a business trip in Greece. And he left the day before
yesterday.
| A．mustn't have been | B．couldn't have been |
| C．might not be | D．should not be |
Until we lose them, scarcely＿＿ how much pleasure and happiness our ordinary lives offer.
| A．we realize | B．do we realize |
| C．did we realize | D．we have realized |
--- Mr. Li will drive us to Shanghai tomorrow.
一But I suppose taking a train would be a better choice: He＿＿like crazy, you know.
| A．drives | B．will drive |
| C．is driving | D．drove |
The most challenging job for game designers is to make their games interesting＿＿．
| A．to play | B．to be played |
| C．played | D．being played |
--- I don't remember having ever seen John since last week. Has he gone somewhere?
一Not really. He＿＿his newly-bought apartment.
| A．has decorated | B．was decorating |
| C．decorated | D．has been decorating |