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③ will have→have

③ has already→ had already

② will rain → rains

② have been →were

③ has → had

① 　has been performed 　　 →had beenperformed

I have been taking vitamin supplements since last year.

had been reading for an hour when he came

I arrived at the bus stop,the bus had already left

my parents will be traveling though Europe

have seen an immense increase in

will your son have been working

Just as the train was about to leave

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② hold → held

④ disturb →be disturb

③ should avoid →should be avoided

③to lay off →to be laid off

fuilire was caused by his lack

natural wealth should not be utilized until

is thought to have escaped

He is spoken highly of by his colleagues

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