________ the important documents were needed_______.

The buses, ________ were already full, were surrounded by an angry crowd.

Facebook is one of the most popular websites in Britain ___ over twenty-five million users.

nd has decided to begin building its first standard-gauge railways in cooperation with China, ______may cost $12.2 billion.

Why are youso _______,Amy—-I thought I lost my purse, but I didn’t. Ifound it in my study!