a) Hoa (0) (live) lived in Hue last year, but now she (1) (live) lives in Ha Noi. Yesterday, Hoa's friend Nien (2) (send) sent Hoa a letter. Nien (3) (be) was Hoa's neighbor when Hoa lived in Hue. She (4) (be) is younger than Hoa.
b) Lan (0) (be) is Hoa's best friend. The two girls (1) (be) are...