Listen, repeat and read.
[k] − ba$\mathbf{\text{ck}}$, $\mathbf{\text{k}}$idnap, $\mathbf{\text{c}}$a$\mathbf{\text{k}}$e, house$\mathbf{\text{k}}$eeper
[ʧ] − $\mathbf{\text{ch}}$ild, $\mathbf{\text{ch}}$ance, adven$\mathbf{\text{tur}}$e, wi$\mathbf{\text{tch}}$, whi$\mathbf{\text{ch}}$, tempera$\mathbf{\text{tur}}$e
[ɔ:] − fo$\mathbf{\text{ur}}$, m$\mathbf{\text{ore}}$, n$\mathbf{\text{or}}$mal, w$\mathbf{\text{ar}}$, w$\mathbf{\text{ar}}$drobe, f$\mathbf{\text{au}}$n, c$\mathbf{\text{all}}$, $\mathbf{\text{al}}$ready
[əʊ] − $\mathbf{\text{o}}$ld, $\mathbf{\text{ow}}$n, foll$\mathbf{\text{ow}}$, wardr$\mathbf{\text{o}}$be, cl$\mathbf{\text{o}}$se, b$\mathbf{\text{o}}$th
[u:] − ch$\mathbf{\text{oo}}$se, s$\mathbf{\text{oo}}$n, t$\mathbf{\text{oo}}$, m$\mathbf{\text{oo}}$n, r$\mathbf{\text{oo}}$m, gr$\mathbf{\text{ou}}$p, m$\mathbf{\text{o}}$ve
[ɜ:] − h$\mathbf{\text{er}}$, f$\mathbf{\text{ir}}$st, w$\mathbf{\text{or}}$th, w$\mathbf{\text{or}}$ld, T$\mathbf{\text{ur}}$kish