It was so cold that they kept the fire ____ all night.[ ]

His study was a mess with lots of books and magazines __________up everywhere.

derstandings ________ from lack of social communication, unless ________ properly, may lead to serious problems

So hard ______ in the past few months that he hasmade great progress in English.— I can see that; only a few mistakes ______ in theexam.

Getting to other planets or to themoon _____ many problems