Chia động từ trong ngoặc sau:
1, Lan has difficulty in (speak) English .
2, Do you know what the animal ( symbolize ) Australia ?
3, John' class ( start ) at 7 a.m and ( finish ) at 4.30 p.m
4, The United Kingdom and New Zealand (be) English speaking countries
5, The number of English speakers in the world (increase) considerably in recent years