(In, on, by, etc.)
Prepositions are difficult to learn. One reason is that the learner often refers back to his or her own language and uses the same preposition in English. This does not always work. Prepositions are idiomatic in the sense that they are not always easy to translate from one language to another.
Furthermore, there are very few rules to help you understand why one preposition is correct and another is incorrect. As is the case with all language learning, one needs to use prepositions in our reading, writing, and in our conversations in order to become a fluent English speaker. Quizzes like this help. The rest is up to you.
Choose the best response by clicking on it. If both the first and second choices are correct, then choose the third option: '(Either is correct) as this will be the best answer possible.'
The timer gives you 15 seconds to find the answer. It notes your errors but it only shows you the correct answers at the end.
If you don't use the timer you see the correct answers immediately, and in many quizzes you can click on Another example to see a similar word or sentence.