.We cannot figure out ____quite a number of insects, birds, and animals are dying out.
— What’s your opinion about my suggestion?— Sorry, I ___________. Would you please say it again?
He had to pause from time to time to wipe the sweat from his forehead, because the air—conditioning system ______________.
____________ everyone here, I wish you a pleasant journey back your country.
— Are you satisfied with his answer?— Not at all. It couldn’t have been ______________.
I’d appreciate ___________ if you could let me know in advance whether or not you will come.