1. Go s________ ahead, and you can find the entrance.
2. Not having seen him for so long a time, I can hardly r________ him.
3. I'm sure he is from the southeast according to his a________.
4. In summer, when a thunder storm comes up, there is always l_______ and thunder.
5. A small town has a small number of b________.
6. I can't express my feelings with ________ (词语).