---How do you learn English? ---I learn watching English videos.
| A．to | B．of | C．by | D．at |
---Did you get there by ______ bike?---No, I took ______ taxi.
| A．a; a | B．不填; a | C．the; the | D．a; the |
—Would you like to go out for a walk with us?
— ,but I must finish my homework first.
| A．Of course not | B．That’s all right | C．Yes, I’d love to | D．Yes, I do |
I usually sleep with the window open _____ it’s very cold.
| A．until | B．unless | C．when | D．if |
We have to _________our school trip till next week because of the heavy rain.
| A．put off | B．put on | C．put up | D．put down |