___ had they reached the 30th floor ____ they realized that they had forgotten to take the key.
Bobby ________ me your secret, but he meant no harm.
The speed of cars and trucks is ________ 30 kilometers per hour in large cities in China.
If you cheat in the exam, you could hardly ________ it.
It was for this reason ________ her aunt moved out of Shenzhen and settled down in a small village.
As we all know, an island is a piece of land ________ by water.