Ex.1(a), p.48 (orally);

Ex.1(b), p.48 (in pen);

Ex.3(a), p.49 (to read and translate);

Ex.3(b), p.49 (orally);

Ex.3(c), p.50 (in pen);

Ex.6, p.51 (by e-mail).

Ex.5, p.51 (in pen);

Ex.2(a), p.52-53 (to read and translate);

Ex.2(b), p.53 (in pen);

Ex.3(a), p.59 (in pen);

Ex.5, p.56 (by e-mail).