Suggest reagents that would accomplish each of the steps (i), (iii), (v), and (x). Note that a combination of several reagents is required for some of these steps (e.g. lithium azide (LiN3) in THF, then water in step (vi)). 

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CH2OH но но ii Pb(OAc)4 iv. HCI (aqueous) Но- Но- CO,Et -O- -HO- H OH ČH2OH v. 2 TBSO TBSO TBSO vi. LIN3, THF then H20 vii-ix N. 1 3 N3 TBS = tert-butyldimethylsilyl (-Si((CH3)2C(CH3)3)) Ac = acetyl (-COCH3) CH2OH но но ii Pb(OAc)4 iv. HCI (aqueous) Но- Но- CO,Et -O- -HO- H OH ČH2OH v. 2 TBSO TBSO TBSO vi. LIN3, THF then H20 vii-ix N. 1 3 N3 TBS = tert-butyldimethylsilyl (-Si((CH3)2C(CH3)3)) Ac = acetyl (-COCH3)