ex1 : (giúp mình với các bn chiều nay mình nộp đề r) 1._________upstairs(to go) 2._____________in this lake(not/to swim) 3.___________your homework(to do) 4.__________football in the yard(not/to play) 5.___________your teeth(to brush) 6._____________during the lesson(not/to talk) 7._____________the animal in the zoo(not/to feed) 8.__________the Instructions(to read) 9.____________late for school(not/tobe) 10.____________your mobiles(to switch off) 11.___________our brother(to ask) 12._____________a pencil(not/to use) 13.__________up(to hurry) 14.___________quiet(to be) 15.__________the police(not/to call) 16.________your beds(to make) 17. Please__________the gap(to mind) 18._____________dad about my accident(not/to tell) 19. Please____________in this room(not/to smoke) 20.Let's_____________her mother in the kitchen(to help)