Can you work out the maths problem?— Sorry, I can ______ understand its meaning.

You are great! Congratulations on winning the first prize! —Thank you! Mr. Yu You__________ me to practice again and again every day.

They develop their skills _________ they can do things better and better.

The library is _____ the restaurant and the supermarket. [ ]

This is _____ best kind of _____ pen you can get here.