Fill in the gaps with modal verbs 1. you take a bus to get to the museum 2. you have been travelling all day, you be tired 3.you open the window. 4.i learn this grammar rule 5.) cross the street when the light is red 6. i clean the windows 7. it's grown dark in the i switch on the light? 8.we needn't paper the walls this year but we paper them next tear 9.she says i must do it at once, but yesterday do it just as quickly