how many ___________ (pencil- box )are there in the clanssroom?填空 they are ------------------

问题描述:

how many ___________ (pencil- box )are there in the clanssroom?填空 they are ------------------
how many ___________ (pencil- box )are there in the clanssroom?填空
they are ( putting cans into some_bags)括号部分提问

(pencil- boxes
what are they doing?