Điền giới từ thích hợp vào chỗ trống: 1. Nick used to go to the library from time to time to look ____ articles ____ the subject he was very fond ____. 2.This job would be impossible ____ the help of computer. 3. At first, my English homework was full ____ mistake. 4. Please write ____ ink. It's hand to read if you write ____ pencil. 5. If you have a problem, talk ____ the teacher. 6. Going there ____ taxi is more expensive than travelling ____ the bus.