Could it be in the public phone box ______ you made me the call yesterday ______ you lost your IP card?

The safety of food has become one of the _________ problems in our daily life.

The girl looked at me with a____expression Maybe the problem was quite ___

Will you please go to Mr Zhang’s birthday party tomorrow—._________ if you do.

You should have told me there was no meeting today, I ___ have run all the way here through the heavy rain.