The problem ________ to be more difficult than we had supposed.

If an excellent Chinese novel is translated into English, ________ means many more people in the world can enjoy it.

He used to travel far and________, so he got ________ on geography.

I couldn’t do it ________ your great help. Thanks alot!

Luckily,we’d brought a road map without ______ we would have lost our way.[ ]