The water dark and dirty. It’s no longer safe to drink.
A.became B.will become C.has become D.was becoming
Be quiet! A bird ________ something by the window.
A.ate B.eats C.is eating D.was eating
I didn't hear you because I the news on the radio.
A.listen to B.am listening to
C.listened to D.was listening to
This medicine _______ millions of people’s lives since it was put into use.
A. is saving B. will save C. has saved D. had saved
Even if you learn something well, you it unless you use it.
A. forget B. forgot
C. have forgotten D. will forget
My mind wasn’t on what he was saying so I’m afraid I __________ half of it.
A.missed B.was missing
C.will miss D.would miss
