Lady Gaga has put off her concerts because of the difficulties _____

Lady Gaga has put off her concerts because of the difficulties ______ by the ongoing strikes.

#92743

causing

to be caused

caused

to cause

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He was thinking about the problem when an apple fell off the tree, _______ him right on the head.

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hit

having hit

hitting

and hitting

Have you seen the man ___________on the grass in the picture?

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lay

lain

laying

lying

— Have you any letters _____?— No, thanks.

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to be typing

to type

to be typed

typed

-----You were brave enough to raise objections at the meeting.　　-----Well, now I regret ____that.

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to do

to be doing

to have done

having done

However frequently       , the works of Shakespeare always attract many people.

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performed

performing

being performed

to be performed

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