某热气球体积为1000m³，能载重6900N，若空气密度ρ=1.29kg/m³，则热气球受到的浮力为　 ____　N，它的自重为　 ____　N．（g取10N/kg）

The big store ____ (sell) clothes.

    Mike and Mark are brothers. In some ways they are the same, but in some ways they are different. They both have____ and brown hair. But Mike is taller than Mark. Mark is ____than Mike. They both like sports. But Mike's favorite sport is ____ and Mark likes basketball best. Mike is ____ He is better at all the subjects than Mark. But Mike is ____ Mark is outgoing. He is better at making friends with others.

Written test part