7.Darwin eventually put forward a model of _b_i_ol_o_g_i_ca_l__ evolution. 8.On the _ra_r_e_ occasions when they met he hardly even dared speak to her. 9.By _c_o_m_p_a_r_is_o_n__, expenditure on education increased last year. 10.She was _a_p_p_a_re_n...