While building a tunnel through the mountain, ________ .
Small computers need small amount of power, _______ means you use less electricity.
If a shop has chairs _______ women can park their men,women will spend more time in the shop.
There were dirty marks on her trousers _______ she had wiped her hands.
He was educated at a local grammar school, _______ he went on to Cambridge.
Just like a voyage at sea,our life journey, _______ days are limited,is full of difficulties.