The number of species from the following in which the central atom...

${H}_{2}Ohas{sp}^{3}$ hybridisation and angular shape due to $2$ lone pair of electrons.

${NH}_{3}has{sp}^{3}$ hybridised nitrogen atom and pyramidal shape due to $1$ lone pair of electrons.

${SiO}_{2}has{sp}^{3}$hybridised atoms, it is a network solid and the shape is tetrahedral around each silicon atom. 

${SO}_{2}has{sp}^{2}$ hybridised sulphur atom and the shape is V-shaped due to $1$ lone pair of electrons.

${BF}_{3}has{sp}^{2}$ hybridised boron atom and the shape is trigonal planar.

${BeCl}_{2} \to sp$

${CO}_{2} \to sp$

${CH}_{4} \to {sp}^{3}$

Hence the answer is $4$