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*Chứng minh rằng: a) $5^{5}$ - $5^{4}$ + $5^{3}$ chia hết cho 7. c) $24^{54}$ . $54^{24}$ . $2^{10}$ chia hết cho $72^{63}$
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A. Complete the following passage with a suitable word chosen from the box. by were looking family whom children in while used attracted When the (1)............. lived (2).............. the city, Mr. Green (3)............. to take his (4).......... to the circus. The children often enjoyed (5).......... at colorful posters on the walls (6)................ their father got tickets from the ticket booth. The shows (7)......... always good. The older children were (8)............ by the acrobats and the lion-tamers most of all, while their younger brothers and sisters were fascinated (9) ............. the performing animals. They kept talking about the lion-tamer (10)............... they admired a great deal and about the clowns who made them laugh a lot. B. Read the following passage carefully and fill in the blanks with suitable prepositions. THE OPENING CEREMONY OF SEA GAMES The eighteenth Sea Games took place (1)................ Chiang Mai - Thailand in the winter (2)....................1995. Competitors (3) ............. ten countries of this area - all must be amateur athletes were sent there to take part (4)........... sport events (5)........... different kinds. In the opening ceremony, all athletes lined up (6)............the field. Each delegation stood (7)............ its national flag. (8)...........that, the athletes began to march proudly in front (9)...........the stand to express their friendship and sportsmanship. People carried a torch to the high tower and its flame would burn there (10)..............the games.

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