_____air pollution getting worse, the government needs to come up with some effective measures to deal with it.
Mrs. Brown was much disappointed to see the washing machine she had had____ went wrong again.
“Alice, why didn't you come yesterday?” “I______, but I had an unexpected visitor.”
He just does what he pleases and never _____ about anyone else.
“Haveyou seen _____ pen? I left it here this morning.” “Is it _____ black one? I think I saw it somewhere.”
After ____ seemed like hours he came out with a bitter smile.