根据下列句子所给汉语意思写出空缺处单词，或根据所给词写出正确形式。

小题1:We're in the building _________ (在…对面) the government offices.

小题2:________(政治上) and economically this is an extremely difficult question.

小题3:Though ten years old, this book is highly ___________ (推荐).

小题4:Delivery times are arranged at your __________(方便).

小题5:I have no doubt that the man is guilty and that he deserves __________(惩罚).

使用现场无线通信电台讲话时，话筒与嘴的距离约（）cm。

A、5

B、10

C、15

D、20