____________better ways for digging tunnels__________, the first railway tunnel under the River Thames was dug in 1884.
32.He was very busy, and________he didn’t go to the party that night.
31.America was_________was first called “India” by Columbus.
30.It seems water___from the ceiling for some time . We’ll have to climb to the roof with a ladder.
29.To pass the exam, Li Hua had a busy week ______ to the radio and the tape.
28.With so much work _____ with , I doubt if I shall have time to visit you.