Write sentences, using the clues given. 1. many schools/ the world/ found/ the beginning of the 20th century. ___________________________________________________________________________ 2. it/ nice/ John/ give/ us/ lift/ the train station. ___________________________________________________________________________ 3. there/ be/ dramatic/ increase/ the number/ people/ travel/ abroad/ recent years. ___________________________________________________________________________ 4. I/ prefer/ ride/ my bicycles/ catch/ bus/ school/ every morning. ___________________________________________________________________________ 5. Saigonese/ expect/ that/ new/ metro system/ can/ solve/ traffic problem ___________________________________________________________________________ 6. how long/ you/ know/ him/ before/ he/ get/ married? ___________________________________________________________________________ 7. traffic system/ Ho Chi Minh City/ be/ upgraded/ the last five years. ___________________________________________________________________________ 8. he/ be/ disappointed/ see/ she/ be/ not/ the party. ___________________________________________________________________________ 9. it/ be/ impossible/ me/ wear/ rubber sandals/ school. ___________________________________________________________________________ 10. before 1990/ Vietnamese people/ live/ extended families. ___________________________________________________________________________

Một dây dẫn được mắc vào hiệu điện thế 20V thì cường độ dòng điện qua nó là 5A. Nếu giảm hiệu điện thế đặt vào hai đầu dây dẫn đi 4V thì cường độ dòng điện chạy qua dây dẫn khi đó là:

Trên một biến trở con chạy có ghi 60 ôm - 2A. Thông tin nào sau đây là sai?