Are you satisfied with what the captain explained? —Not at all. It couldn’t have been________.

____ difficult the task may be, we will try ourbest to complete it in time.

The price of oil is much _____________ than before so that many people go to work by bus instead．

Could you please give me some ________ I’m hungry.

一Where are you going for your winter vacation一Wego to Hainan, but we are not sure.