【導(dǎo)讀】house.—I’mafraidI.Ihaveto. lookaftermysister.It’llbeyourturnsoon.School.petition,asinlife,younotalwayswin.10.—Look!11.—Iswimhere?o’clock.—No,you.yet.17.—IsJimingbytrain?you____(buy/bought)acartenyearsago?—Yes,you____(can/could).—Yes,he____(can/could).—Sorry,you____(can’t/couldn’t).