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phamhue9203
2 năm trước
Chiếu 1 tia sáng tới gương phẳng G, cho tia phản xạ IR tạo với gương 1 góc 450 a/ Hãy vẽ tia tới b/ Tính góc tới và góc tạo bởi tia tới và tia phản xạ giúp mik với mik cần gấp
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III/ Write the correct form of verb to fill in the brackets Nowadays, a lot of important inventions (1- carry out) by scientists (2- work) for large industrial firms. However, there (3 – be) still opportunities for other people (4 – invent) various things. In Britain, there is a weekly TV program which (5 – attempt) to show all the devices which people (6 – invent ) recently. The people (7 – organize) the program receive information about 700 inventions per year. New ideas can (8 – develop) by private inventors. However, it is important (9 – consider) these questions : Will it work? Will it (10 – want)? Is it new? 1. __________________ 6. ___________________ 2.__________________ 7. ___________________ 3. __________________ 8. ___________________ 4. __________________ 9. ___________________ 5. __________________ 10. __________________ IV/ Write the correct preposition to fill in the blank. 1. Could I help you ______________ your bag? 2. Na got up late this morning because her alarm clock didn’t go ___________ . 3. I’m looking forward ____________ seeing you in June. 4. In the competition, everyone fell ______________ the deep and dangerous water. 5. Ha Long Bay is recognized _____________ UNESCO as a World Heritage Site 6. They have a meeting ___________ 6.30 and 9.30. 7. My mother often picks me ___________ from the school. 8. I’m going to invite my friends to come over ___________ dinner tonight. 9. Next summer, my family will have a vacation __________ Thailand and stay there ________ one week.

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