\(A=\left(\dfrac{\sqrt{x}+1}{x-4}-\dfrac{\sqrt{x}-1}{\left(\sqrt{x}-2\right)^2}\right)\left(\dfrac{\left(\sqrt{x}-4\right)\left(\sqrt{x}+4\right)}{\sqrt{x}+4}+\dfrac{4}{\sqrt{x}}\right)\\ =\left(\dfrac{\left(\sqrt{x}+1\right)\left(\sqrt{x}-2\right)}{\left(\sqrt{x}-2\right)^2\left(\sqrt{x}+2\right)}-\dfrac{\left(\sqrt{x}-1\right)\left(\sqrt{x}+2\right)}{\left(\sqrt{x}-2\right)^2\left(\sqrt{x}+2\right)}\right)\left(\dfrac{\sqrt{x}\left(\sqrt{x}-4\right)}{\sqrt{x}}+\dfrac{4}{\sqrt{x}}\right)\\ =\left(\dfrac{x-2\sqrt{x}+\sqrt{x}-2}{\left(\sqrt{x}-2\right)^2\left(\sqrt{x}+2\right)}-\dfrac{x+2\sqrt{x}-\sqrt{x}-2}{\left(\sqrt{x}-2\right)^2\left(\sqrt{x}+2\right)}\right)\left(\dfrac{x-4\sqrt{x}+4}{\sqrt{x}}\right)\\ =-\dfrac{2\sqrt{x}}{\left(\sqrt{x}-2\right)^2\left(\sqrt{x}+2\right)}.\dfrac{\left(\sqrt{x}-2\right)^2}{\sqrt{x}}\\ =-\dfrac{2}{\sqrt{x}+2}\)

Dear Tom,

That's great news that you're going to Soc Trang Province for the Ok Om Bok Festival! It's a wonderful opportunity to experience the local culture. Here are some dos and don'ts to keep in mind:

Dos: Respect the local customs and traditions. Observe and follow the practices of the festival. Dress appropriately. Wear comfortable clothes, but make sure they are respectful and modest.

Don'ts: Avoid causing any disruptions or disrespecting the festival rituals. Don't litter. Keep the surroundings clean and dispose of waste properly. Enjoy your time at the Ok Om Bok Festival and have a memorable experience!

Best regards,
[HaNa]

4. B - were arriving
Giải thích: "were arriving" là thì quá khứ tiếp diễn, không phù hợp với ngữ cảnh câu.

=> Đúng nên sử dụng là "arrived".

5. A - salt
Giải thích: "salt" là danh từ, trong câu này cần sử dụng tính từ để mô tả hương vị của cá.

=> Đúng nên sử dụng là "salty".

1. It is a custom in my family to have _ __ breakfast at home on Sundays.

2. When visiting a family home in some countries, you should bring __a_ small gift with you.

3. Our village festival is held on the 10th of ___ January.

4. Ancient Egyptians worshipped __the_ Sun.

5. Many people think that hard work is _an__ important Vietnamese value.