Most of the roads were covered with thick snow, ____ made our journey more difficult.

 --- How many of you have solved the math problem?--- ________, the math problem is far too difficult for us to work out. .

The famous actor told me that _ could be more important to him than his family.

— _______ iphone4 is this on the table?— I think it’s my sister’s.

The potential of economic development of one region varies from ______ of another.