--Who has broken the window in my room? --Who else _________ it but your naughty son!
52. -Why don’t we take a little break? -Didn’t we just have _______?
53. If you want to change for a double room you’ll have to pay ___$15.
54. We should always keep ______ well-informed of the changing information.
55. Give the message to ______ is at the table.
56. I found _______impossible for _______to work out the maths problem.