Most birds find it safe to sleep in the trees, but ____ they have eggs or young chicks, they don’t use a nest.
| A．why | B．how | C．unless | D．where |
相关试题
-- Ann is in hospital.
-- Oh, really? I __know. I __ go and visit her.
| A． | didn't; am going to | B． | don't; would |
| C． | don't; will | D． | didn't; will |
The population of Jiangsuto more than twice what it was in 1949. The figure is now approaching 74 million.
| A． | has grown | B． | have grown | C． | grew | D． | are growing |
Some of you may have finished unit one., you can go on to unit two.
| A． | If you may | B． | If you do | C． | If not | D． | If so |
The government plans to bring in new laws _____ parents to take more responsibility for the education of their children. 
| A．forced | B．forcing | C．to be forced | D．having forced |
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