Was it______ Tom’s carelessness______  your keys were lost?

Nowadays the belief has become common ______ sea food and fruit rich in vitamin C should never be eaten at the same meal.

 —What should we pay more attention to if we go north in winter, Mum?—Nothing much. Take warm clothes________ the weather is cold.

Progress so far has been very good. ______, we are sure that the project will be completed on time.

He raised his voice, ______ we still couldn’t hear anything．