Basic Gerunds and Infinitives (links to Englishpage.com)
Exercises 1 - 10 are based on Part 1 of the Gerunds and Infinitives Tutorial.
Intermediate Gerunds and Infinitives
Exercises 11 - 20 are based on Part 2 of the Gerunds and Infinitives Tutorial.
Advanced Gerunds and Infinitives
Exercises 21-30 are based on Part 3 of the Gerunds and Infinitives Tutorial.
Other recommended links:
Gerund: definition, formation, use, rules