Would you check my sentences?

Hello, native English speakers,
Would you check my sentences? Would all sound natural?
(a) If it snows tomorrow, we will go to the lake.
(b) We were too hungry to run.
(c) Study English as hard as possible.
(d) Either Mary or I will go there.
(e) I'll go to the village even if it rains hard/heavily.
(f) Did you enjoy yourself at the party last night?
(g) How tall are you?
(h) I want you to help me.
(i) Can you tell me if Tom is coming to your party?
(j) Meg is not my sister, but my cousin.
(k) Mary told me a lie.
(l) I'll stay here until (/ till) you come back.

Hirashin

I'd take out the comma in (j) but everything looks OK.

Oh, Lothor. Nice to see you again. Thanks for the help.