You will find ____ to learn to repair bikes. Many people learn it all by _______.

hardly rung the bell ________ the door was opened suddenly, and my son rushed out to greet me.

Was it ________ the conference of APEC that made Shanghai the focus of the world then?

Every boy and every girl ___ toattend the English evening party to be held on Saturday.

I have been staying up until midnight since Monday, working on my paperI need to ______ some sleep this weekend