小题1:We will turn off the lights for an hour on Earth Day.(对划线部分提问)
________ ________ we turn off the lights for an hour?
小题2: Shall we have a picnic at the weekend? (改为同义句)
________ ________ having a picnic at the weekend?
小题3:“Will you please open the window?” she said to him. (将直接引语改为间接引语)
She ________ him ________ open the window.
小题4:They kept on talking until the teacher came in. (改为同义句)
They didn’t ________ ________ until the teacher came in.
小题5: The new high-speed Hangzhou-Shanghai line started running last year. It cost about 29 billion yuan. (合并为含定语从句的句子)
The new high-speed Hangzhou-Shanghai line ________ ________ about 29 billion yuan started running last year.
小题1:When will
小题2:What/ How about
小题3:asked; to
小题4: stop talking
小题5: that/ which cost
小题1:对时间提问用疑问词when，后跟一般疑问句，助动词will提前，故本题空格处填When will 。
小题2:本句是提出建议，也可以用what about或how about提出建议，后跟动名词，表示……怎么样的含义，故本题空格处填What/ How about 。
小题3:本句的含义为她叫他把窗户打开，ask sb to do sth表示叫某人做某事，故本题空格处填asked; to。
小题4:本题的含义为也可以为直到老师进来的时候他们才停止说话，stop doing sth表示停止做某事，故本题空格处填stop talking 。
小题5:修饰名词高铁线为定语从句，先行词为物关系词可用that或which，本题表示过去，从句谓语动词用价值的过去式cost，故本题空格处填that/ which cost。