Scientists have reached the disturbing conclusion __________ the amount of the solar energy reaching the Earth's surface has been gradually falling.
Could I speak to __________ is in charge of International Sales, please?
Why not try your lick downtown, Bob? That’s __________ the best jobs are.
The seaside here draws a lot of tourists every summer. Warm sunshine and soft sands make __________ it is.
__________ parents say and do has a life-long effect on their children.
__________ matters most in learning English is enough practice.