Mr. Black is a careful and experienfed engineer, so he is often _____ to finish some challenging tasks.
Can you believe that in ___ a rich country should be ___ many poor people?
Mis Smith is a friens of ___.
--Has the train arrived yet?---No, it ought to ___ twenty minutes ago.
I didn't expect that so many people ___ to join in the work.
Mr.Brown ___ goes to bed before midnight.