We recently did a simple experiment, which happens to ________ how children's knowledge of what a hero is like determines their behaviour.

Youth is often ______ with freshness, happiness and other beautiful things.

After the mass shootings at Sandy Hook Elementary School, President Obama ordered his members to ________ solutions to gun violence.

Beyond, a famous rock band, played its last concert in 2005 and then it officially ______ in Singapore.

Rather than ________ on a crowded bus，he always prefers ________ a bicycle.