— I’d like to invite you to our party this weekend.— Thank you, but _________I’ll have time I’m not sure at the moment.
Achieving a high degree of proficiency in English as a foreign language is not a mysterious _____ without scientific basis.
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.