He __________ his sight ten years ago.Since then he has been blind.
The teacher asked the students __________ her _______ the word again.
Remember ______ the book here tomorrow.
---Let's have a rest, shall we? --- Not now. I don't want to stop _______ the letter yet.
---This physics problem is too difficult. Can you show me __________, Wang Lin? --- Sure.
--- How can I improve my spoken English? --- You have to practise ______ as much as you can.