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Here is answers to
1) No central atom or lone pairs, 1 single bond (H is exception only wants 2 electrons)
2) No central atom or lone pairs, 1 single bond (H is exception only wants 2 electrons)
3) O is central atom and has 2 lone pairs, 2 single bond (special way to draw it!!)
4) N is central atom and has 1 lone pair, 3 single bond
5) Be is central atom and no lone pairs, 2 single bond (Be is exception and wants 4 electrons)