53. In the 2008 Olympics Usain Bolt from Jamaica was man in the 100 metre sptint. a) fast; b) the fastest; c) faster; d) the fast54. We`re very busy tomorrow so we time to visit you. We aren`t sure.a) could not have; b) might not have; c) ought to have; d) must not have55. There was no bus, so we to walk home.a) could ; b) had; c) must; d) should​