按要求完成下列句子，每空一词。
1.You should pay attention to your pronunciation in learning English.(改为被动语态)
Attention should ________ ________ to your pronunciation in learning English.
2.The teacher allowed Jack to take the test later.(改为同义句)
Jack ________ ________ to take the test later.
3.He looked sad because he failed the English exam.(对画线部分提问)
________ ________ he ________ sad?
4.Jack isn't silly. I think.(合并为一个句子)
I ________ think Jack ________ silly.
5.Jane failed the math test last week.(改为同义句)
Jane ________ ________ the math test last week.
1.be paid 2.was allowed 3.Why did；look
4.don't；is 5.didn't pass