Please help me and tell wich sentences are right
1.I can't resist buying things when they're in the sales.
2.We've got to encourage students to study,not blame them for not studying.
3.he expected to give a brand new computer for Christmas,but all he got was a second-hand watch.
4.William sometimes seems to be afraid of working hard.
5.He can't help to come to avoid doing anything that involves to use hs brain