One-third of the area ________ covered with trees. About seventy percent of the trees ______

 One-third of the area ________ covered with trees. About seventy percent of the trees _______ been planted recently.

#85732

is; has

is; have

are; have

are; has

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We collected a lot of books to get the necessary information but only half _________helpful, so we failed to finish the work.

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are

was

were

 You, who ______ his good friend, should help him get out of trouble.

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are

was

One or two days ____quite enough to complete the work. ___ you or he going to work with me?

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is; Is

is; Are

are; Is

are; Are

He always dreams of ______ a chance for him to go abroad for further study．

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there being

there to be

there is

being

When  ______  the United Nations founded?

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are

was

were