Of all the streets in Beijing, Wangfujing is _______.

When you feel helpless and _______, just remember you are not _____ in the worldbecause your friends are around you, including me.

Some animals can even see things ____________ in the dark.

Traveling around big cities by taxi can cost a lot of money, but it's usually        to take the underground train to most places.

Justin Bieber has many good songs. They are_______ with young people.