After a long walk, Mary’s legs _____ and she couldn’t run any further.
. -- Jack _______ for work in the downtown. What was the matter? -- _______, but he had no luck.
What __ public is concerned about is whether the scientists win be able to find _______ cram for the disease.
Alice was_________the letter from Tom, but it didn't reach her for some reason.
It ______ last night ______ Tom saw an interesting film in Dongfeng Cinema.
Only when class began ______that he had left his book at home.