Ex 1: Choose the best answer A, B, C or D to complete the sentences 31. The Nile is the longest ______in Africa. A. lake B. river C. bridge D. road 32. England is a part of _______ A. Europe B. Asia C. America D. Africa 33. We can swim here. It’s a____ A. lake B. mountain C. bridge D. road 34. What ________do they speak in China? A. flag B. language C. city D. money 35. The ________of Vietnam is Hanoi. A. flag B. language C. money D. capital city 36. There is one star on the Vietnamese _____ A. flag B. language C. city D. money 37. You ______drive your car. You can take a bus. A. have to B. has to C. don’t have to D. mustn’t 38. We__________ eat in class. A. have to B. has to C. don’t have to D. mustn’t giúp mik vs , chỉ cần ghi câu trl thôi ạ