填入适当的词。

1. I haven't heard from him_______ he went to America.

2.He won't be here_______ he is invited.

3. He will not go to the cinema______ he is very busy.

4. We found the key_______ she had left it.

5. We found the books two days ______he had gone away.

6. We had no sooner got to the station ________the train left.

7. He speaks English ______ he were an Englishman.

8.He is explaining clearly______  they can understand.

9. Do not leave the room______ you have finished the test.

10. She sang______ she went along.

在某工程的施工招标中，某施工单位中标后被要求垫付建设资金280万元人民币，双方在合同中约定了垫资条款，但未约定垫资利息。根据有关司法解释，下列说法中，正确的是 ( )。

A．由于当事人对垫资利息没有约定，按照工程欠款处理

B．对施工单位支付垫资利息的请求不予支持

C．应当按照中国人民银行发布的同期同类贷款利率计息

D．应当按照不高于中国人民银行发布的同期同类贷款利率的4倍计息