----Oh, my God I can’t help worrying about my school report.----____ .You can do nothing but wait.
Every possible means __________ to prevent air pollution, but the sky is still not clear.
We must __________ to the public the simple fact thatdrugs are dangerous.
That was the first time __________ I __________ face to face with the president.
I walked up to the top of the hill with my friend, __________ we enjoyed a splendid view of the lake.
The dam was not strong enough to __________ thefloods.