1. Don't forget to watch the Cricket tonight. 
2.Tell me the importance of plants.
3. I heard the roaring of a lion.
I hope it is correct and pls mark as the best answer. :-)

but do we say.."don't forget to go there"..?
so wht ur tchr told means like the mistake in dat senetnce is based on infiniye?
no. we don't say that. we say "don't forget about going there".
yeah..i was wriiten by mistake..