While ____ the dog, you should take care not to get loose . Otherwise, it may be dangerous to strangers.

Once ________ at a table, left-handers need to move the water glasses put on the right side to their more convenient left side.

 _______, she is quite modest.

_______, the disease will produce a kind of poison that will kill the patient.

Never ______ so excited because it is the first time that I ______ such a fantastic experience.