英语.一本.091.America ______(discover) by Columbus in 1492.2.The
英语.一本.09
1.America ______(discover) by Columbus in 1492.
2.The two pairs of trousers ______(be) mine.
3.The factory _____(produce) about 900 cars a year.
4.Chicago _______(develop) into a large city in the
late 1800s.