Cathy went to the hospital alone. If she had told me about it, I _____ with her.
—Excuse me, Madam.Taking photos is forbidden here out of security. —I’m really sorry, I _______ of that.
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.