23. The class is unusual_______ the students are all over fifty and none of them attended the middle school when they were young.
| A．in how | B．in what | C．in which | D．in that |
It was two weeks before the Spring Festival and the shopping centre was _____ with shoppers.
| A．full | B．crowded |
| C．satisfied | D．noisy |
Leave your key with a neighbor _____you lock yourself out one day.
| A．ever since | B．even if |
| C．soon after | D．in case |
—Bob has gone to California.
—Oh, can you tell me when he ______?
| A．has left | B．left |
| C．is leaving | D．would leave |
Our plan to ______ a New Year’s party has won supports from our teachers.
| A．organise | B．volunteer |
| C．solve | D．invite |
There was______time when everything to do with__nature could keep Anne spellbound.
| A．a; the | B．the; a |
| C．a; / | D．the; the |