1、【题目】Thedirectorrecommendedthatshe________(study)moreEnglishbeforegoingabroad.

答案：

解析：

1、【题目】Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.

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解析：

1、【题目】Matter is the name ________ (give) to everything which has weight and occupies space.

答案：

given

解析：

暂无解析

1、【题目】Wewerebusy________(get)thingsreadyforthetrialproductionwhenhephonedus.

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解析：

1、【题目】The director recommended that she ________ (study) more English before going abroad.

答案：

study

解析：

暂无解析

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

答案：

解析：

1、【题目】Abeamoflightwillnotbendroundcornersunless________(make)todosowiththehelpofareflectingdevice

答案：

解析：

1、【题目】A beam of light will not bend round corners unless ________ (make) to do so with the help of a reflecting device

答案：

made

解析：

暂无解析

1、【题目】The floor does not look so bad when ________ (sweep) clean. 

答案：

swept

解析：

暂无解析

1、【题目】________ (fail) several times, they need some encouragement.

答案：

Having failed

解析：

暂无解析