David is________animal fur, so he won't visit anyone who has cats or dogs in the house.
32._________on the lonely island_________more difficult than they had expected.
31. —How long_________each other before they_________married? —For about a year.
30. — Have you ever been to Australia? — Never, but I have been looking forward _______ such a chance for further study there.
29. —Shall I call you at 6 a.m., Toby? —No, not that early. I ____.
28. In the coldest of the winter, trees stood with their bare branches(枝干)_________the sky.