You must look at the ball _____(close) when you play badmint

You must look at the ball _____(close) when you play badmint When you cross the street,you must look to _____. When you [ ] the road you must look at the traffic lights中【 when you ____ _____ (穿过）the rpad ,you must look left and rig You must close the windows at night.（改为祈使句） Please remember _____(close) the doors when you leave. You must _____ (look) after the old man. You must not play at the crossing road 变成祈使句 You must not play at the zebra crossing. you must keep the door ___(close)when you go out. look at the___lines.You must cross the street here. You must not look only at the surface of things !