Tom thinks _____ important to get to know his students well.
By using ears one can tell the direction _____ a sound comes.
Don’t forget to take your cellphone with you _____ you can call for help if necessary.
What especially impressed us was the way _____ our teacher studied foreign language.
As you know, this is the day_____ the quake happened thirty years ago.
---Hi , Bruce. Here is a letter for you.--- Thanks. I wonder _____.