However much _______, it will be worth it.

What are you doing? —— I _____ a letter to my pen pal.

Sometimes most of us probably are angry______our friends, parents or teachers.

Look ! _________ students are doing morning exercises on the playground .

Wow! You look different! You ______ wear glasses.－ Yes, I did. But now I have had an eye operation. I can see clearly without them.