Over the next few decades people think that there will be treatments for many more diseases. - [THAT] It __________________________ diseases will be treatable in the coming decades.
is/’s thought that many more
I believe that the government should do more to help protect the environment. - [SHOULD] Regarding the environment, I believe that __________________________ by governments.
more should be done
Customers are allowed to submit documents in two formats; electronic or printed. - [CAN] Documents __________________________ either electronically or printed as hard copies.
can be submitted
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