Question

*TheUnitedKingdom………..1………thefirstcountryintheworldtoallowscientiststocreate human-animalembryosforresearchpurposes.Theresearch……..2………transferringnuclei containingDNAfromhumancellstoanimaleggsthat………3……..nearlyalltheirgenetic informationremoved.Theresultingembryos………..4………..,therefore,mostlyhuman,witha smallanimalcomponent.Stemcells,which……..5……..growintodifferentkindsoftissue,arethen ……….6……….fromtheseembryos.Theembryoscouldgiveresearchersalargesupplyofstem cellstoworkwith.Scientistshave,untilnow,reliedonhumaneggsleftoverfromfertilitytreatment, which are in short supply and often of poor quality.*
1. (a) became; (b) has become; (c) have become; (d) become
2. (a) involve; (b) involves; (c) is involving; (d) has involved 3. (a) have; (b) are; (c) have had (d) had
4. (a) is; (b) are; (c) have; (d) have been
5. (a) may; (b) will; (c) can; (d) could
6. (a) harvesting; (b) harvested; (c) harvest; (d) harvests​

Answer 1

Answer:

has become

involve

had

are

can

harvested

Explanation:

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