用所给动词的适当形式填空。 [[QOrDeR]]The young girl often________(help) her grandma clean the room. 【小题2】This little boy can't ________(swim). 【小题3】Dogs ________(be) very nice. 【小题4】Can we ______(sit) here? 【小题5】These chicks can't ________(eat).Their mum helps them.