It’s not what we do once in a while ________ shapes our lives, but what we do consistently.
The civil war broke out in Libya, ______ to the instability of the international oil price.
Recently a new social issue has been brought to everyone’s attention _____food additives are abused.
While the police have already done a lot of investigation, much evidence _____.
_____ on everyday practice, progress in English is a goal which can be achieved.
Look out! Keep away from the house, _____ the roof is under repair.