Linguia is an online language site which has a quality free collection of comprehension exercises with questions from A1-C1, a vocabulary builder and grammar exercises.

Pros and uses:

• I mostly use it for its really decent set of comprehension exercises for ESL and Spanish- they’re easy to use, well organised and have a good range of vocabulary and grammar to practice. They include topics such as work, family, home, recipes, holidays and celebrations
• Linguia has both English and Business English aswell as 11 more languages including Turkish, Spanish, German, French and Polish.

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Cons/ issues to take into consideration: 

• To access a bigger collection of the material and some of the features (eg. outloud readings of the texts) you need to access premium.

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‍Link: https://lingua.com/