Reorder these sentences

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1. because it is/ messaging her friends/ more convenient/ Lan is fond of/ than calling.
2. must / fail / harder / otherwise, / You / will / study / the / you / exam.
3. the / largest / second / are / ethnic / Tay / group / in / the / Viet Nam?
4. Today farmers / combine harvesters / to harvest their crops / usually use / in my village / goes / with / fishing / friends / his / weekends.