Scientists say it may be five or six years it is possible to test this medicine on human patients.[ ]

Sam spends half an hour_____ TV every day.

The information you give in the application is toogeneral. You should _______ something special about yourself.

I left for the office earlier than usual this morning _____ traffic jam

Zheng He had over 300 ships, _______ some were over 150 meters long and could carry up to 1,000 people.