If you practice ____ English every morning, you will improve it quickly.

So difficult _____ it to adjust to an English-speaking environment that he determined to learn English hard

I looked at the pretty girl carefully, _____ who she could be. [ ]

What about these two coats, madam — ______ of them fits me well. Could you show me _______ one

Lingling is able to _______ with others in English.