15. When ______ into consideration, his problems seemed nothing if compared to hers.

14. The little boy ______ a distance of 150 miles in such a cold weather, ______ in a doctor

　 for his sick mother.

13. ______, the disease would produce a powerful poison that would kill the patient.

12. I was very ______ with John because he promised to help me, and then he did not.

11. She warned us to keep ______ out for thieves while doing shopping at the supermarket.