It’s difficult to ______ the football fans, who were crazy about the victory.

Recently, to maintain national balance, the Chinese government has _______ a policy of encouraging college graduates to take positions in rural areas.[ ]

The suggestion they all objected to________to be effective finally

下列各句中，加点的词语运用正确的一项是（ ）

We all had a lot of fun at the barbecue yesterdayPity you weren’t there.—I really should have gone with you but I________on some remaining problems