It sounds ______to use “Could you…”than “Can you…”．

He is rather difficult to make friends with, but the friendship of his, ________ is more true than any other[ ]

Oxfam trailwalkers in Hong Kong have toclimb________ twenty hills and mountains. —It’s really a tough hike.

Poor Tim! He had his pocket ________on hisway to the theatre. So he had to give up his favourite play.

I got in his old truck and off ______ to one of the far corners of the farm to fix the fence. [ ]