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】I wonder if he could get it ________ (do) before tomorrow.

答案：

done

解析：

暂无解析

1、【题目】Matteristhename________(give)toeverythingwhichhasweightandoccupiesspace.

答案：

解析：

1、【题目】Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice

答案：

解析：

1、【题目】________(catch)intherain,hewaswettotheskin.

答案：

解析：

1、【题目】Herefusedtotelluswhetherhe________(undertake)thejob.

答案：

解析：

1、【题目】heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.

答案：

解析：