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I had no difficulty ........ find/finding your house.
I had no difficulty (in) finding your house.
Oops!
Okay!
Who's to blame ........... making this mess?
Who's to blame for making this mess?
Oops!
Okay!
I like my students to feel ..... ease in the classroom.
I like my students to feel at ease in the classroom.
Oops!
Okay!
Have the opportunity .................... do/doing s.t.
Have the opportunity TO DO s.t.
Oops!
Okay!
They bought the antique ...... auction.
They bought the antique at/by auction.
Oops!
Okay!
You should always take great pride ...... your work.
You should always take great pride in your work.
Oops!
Okay!
I put my money under the bed ..... safe keeping.
I put my money under the bed for safe keeping.
Oops!
Okay!
She has a special aptitude ...... drawing.
She has a special aptitude for drawing.
Oops!
Okay!
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