We use ____ or ____ when the rules say it’s obligatory. We use ____ when it’s possible in the rules. We use ____ to when something is not obligatory but is allowed by the rules. We use ____ or ____ when it isn’t allowed in the rules.

RULES

列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?