76. A …………………………… eruption occurred here last night. (disaster)
77. The beach is full of all kinds of ……………………………. (pollute)
78. He used all his …………………………… to force the door open. (strong)
79. The police are interested in the sudden …………………………… of the valuable
painting. (appear)
80. My teacher …………………………… me to take this examination. (courage)