1、【题目】Thosewho’dliketovisittheexhibition________(sign)yournameshere.

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解析：

1、【题目】He fell asleep immediately last night; he must ________ (be) very tired.

答案：

have been

解析：

暂无解析

1、【题目】He refused to tell us whether he ________ (undertake) the job.

答案：

would undertake

解析：

暂无解析

1、【题目】________(fail)severaltimes,theyneedsomeencouragement.

答案：

解析：

1、【题目】Night________(fall),wehurriedhome.

答案：

解析：