— The doctor is busy _______

— The doctor is busy ________ his work.

#48117

for

with

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     is dangerous _____ play football in the street.

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It , to

It , for

Its , to

Its , of

He is one of_______in China.

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the great scientist

the great scientists

the greatest scientist

the greatest scientists

— Why are you standing, Alice?—I can’t see the blackboard clearly. Two tall boys are sitting_______me.

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behind .

next to

between

in front of

It’s very kind_______you to buy an air ticket________Singapore for me．

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for；for

for；to

of；to

of；of

--- Where is my watch, dad?--- I don't know. You can ask your mother _____ help.

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for

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