On Sundays there were a lot of children playing in the park, ________ parents seated together joking.
We had a marvelous holiday: only the last two days were slightly _____ by the weather.
They were so far away that I couldn't _____ their faces clearly.
Stressful environments lead to unhealthy behaviors such as poor eating habits, which _____ increase the risk of heart disease.
If the boy had _____ the dog alone it wouldn't have bitten him.
We made plans for a visit but _____ difficulties with the car prevented it.