Please excuse me _______ your letter by mistake.
---It’s a long time _____ I saw you last.---Yes, and what a pity it is now that it will be a long time _______ we see each other again.
Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.
Two _____ died of cold last winter.
Riding bikes has advantages __________ driving cars ________ many aspects.
The party last night was _______ success. We sang and danced until it came to _______ end at 12:00.