To save energy at school, I always turn off lights, fans, and projectors when we leave the classroom. I also open windows to use natural light instead of lamps. I do these things every day. They are important because they reduce electricity waste, lower school bills, and help protect the environment for our future.

1. Students should use online resources for learning.

2 . Although she didn't speak English well, she traveled alone to the UK.

1.The students are doing a science experiment in the lab now.

2.Space travel will become affordable for everyone in the future.

3.You shouldn't stay up late to watch TV programmes.

a)Các nhân tố hình thành đất: Đá mẹ, khí hậu, sinh vật, địa hình, thời gian và con người. 

b) Những tác nhân dưới đây là nguyên nhân chính dẫn đến tình trạng ô nhiễm môi trường đất.

a)Đại Cồ Việt, Champa, Pa-gan, Pe-gu, Tha-ton, Campuchia, DVva-ra-va-ti, Ha-ri-pun-giay-a, Sri Vi-giay-a, Bu-tu-an, Ka-lin-ga, Tu-ma-sic

b)