It is the duty of the police to ______ social order.

In that school, German is compulsory for all students, but English and French are_______.

Many football fans attached great importance to the two matches, because China needed to beat Iran to ensure ______for the Asian Cup semi-finals.

Alice is stubborn, as you know. She trusts you and only you can ____ her to give up the foolish idea.

After the snowstorm broke out, what should be immediately done is to provide ________ for those people who lost their homes.

In China people believe in the saying “out of debt, out of pressure”; however in the west, it is just the ______ — when you are in debt, you are trustworthy and financially capable.

The government has to close those small factories to prevent the water of the river ______.

(2014·昆明质检)The five rings on the Olympic flag________the union of the five continents and the meeting of athletes from all over the world.

(2011·浙江卷)I’ve been writing this report________for the last two weeks，but it has to be handed in tomorrow.

(2014·淮南高三质检)When you stand on the top of the mountain and overlook the surrounding scenery，you’ll find it is________to climb it up with effort.