I can’t go to the meeting ______, but I’ll send someone to speak for me.

Just like a voyage at sea, our life journey, ______ time is limited, is full of difficulties as well as opportunities

I want to eat ________ apples. Are there ________ apples here

Heavy objects and light objects fall at the same speed ________ air holds them back.[ ]

He didn’t work hard. _____, he failed his exam again.