1. The mischievous Tom ran about the room accidentally ______ the vase.

2. While Mr Tan ______ in the garden, he spotted a snake.

3. She posted the letter the following day after she ______ it.

4. ______ it is a fierce-looking dog, do not approach it.

5. My taxi arrived ______ I stepped out of the door.

6. We met the fisherman ______ boat was wrecked in the thunderstorm.