You have to wear special clothing, a helmet and a life jacket ____ your raft gets turned upside down or sinks.
—What upsets him?—________ his computer is out of order.
Whether ways will be found to stop pullution or not is just ________ worries the public.
I would appreciate ________ you could give me some advice on learning English.
The local Tibetans and Sherpas laughed at the strange bottles containing ________ they referred to as “English air”.
The decision was made ________ more medical teams would be sent to help people in the earthquake.