介绍:
believe [bi'liːv] v.
may [mei] modal verb
how long
since [sins] prep.
why [wai] adv.
sell [sel] v.
because [bi'kɔz] conj.
retire [ri'taiə] v.
cost [kɔst] v.
pound [paund] n.
worth [wəːθ] prep.
penny ['peni] n.
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