Most of the world’s population ---- on natural exposure to sunlight ---- adequate vitamin D nutrition.
will rely / having maintained
used to rely / would have maintained
is relying / to be maintaining
has relied / to have maintained
Rising health insurance costs and harsh social stigmas ---- many employers to overlook workers’ mental health needs, but ignoring the problem ---- more than addressing it.
are causing / may have cost
have caused / should have cost
Any drug development effort --neurodegenerative disorders ---- carefully any possible side effects.
to have combated / will examine
combating / would have examined
having combated / had examined
to combat / will have to examine
to be combated / would have to examine
Doctors who had been studying longevity ---- an assortment of genes that ---- life span in different organisms.
had identified / could influence
have identified / will be influencing
identified / will have influenced
will identify / had influenced
identify / could have influenced
Various agencies ---- to keep pesticide use within safe limits, and most consumers feel they ---- on them.
are being set up / must have depended
were set up / have depended
would have been set up / must depend
would be set up / were depending
have been set up / can depend
Japanese researchers ---- that tomato juice ---- prevent emphysema, a smoking-related lung disease.
will say / may have helped
Shanghai ---- curb pollution or its citizens ---- rapidly increasing ill health.
will have to / would face
Foot massages ---- those who ---- balance problems.
may have helped / are having
would have helped / may have
Migraine-patients who go untreated for too long---- structural changes in their brains, so they ----proper therapy.
incurred / would insist on
are incurring / insisted on
may incur / should insist on
incur / used to insist on
must incur / would have insisted on
Until quite recently, no one ---- the deadly germ that causes anthrax ---- outside a living host.
has thought / will thrive
had thought / would have thrived
would think / had thrived
