Many children seldom communicate with adults, ________ it difficult for their parents to know what they are thinking about.
The rising house price and the high income tax rate have become the biggest ______ of the ordinary people in China today.
--- She will finish the project within three days! --- ______! I could do it in three hours.
People there now have no _____ to safe drinking water due to the Japanese Earthquake.
He made a _____ of five thousand dollars on the deal.
When we ran to the top of the hill, we were _____ .