Many people can’t learn any lessons from the mistakes they’ve made ________ they get hurt somehow.

f the students in the Occupy Central movement in Hong Kong ______ have participated for more rights, but what they did caused serious effects on people’s living.

Would you like to go hiking with us— ________. I’m preparing for the comingexams.

When you are at home，give acall to let me know yousafely．

Excuse me. I wonder if you can provide me ____ some information about the earth– Sure, ____ pleasure.