按要求改写句子（初三英语两道）
1.They had learned twelve lessons by the end of last term.(就划线部分提问) 提问部分为 twelve
_______ _______ lessons _______ they learned by the end of last term.
2.The workers didn't know what they should do next.（用不定式改写）
The workers didn't know what ______ ______ next.