I don't know why she's looking at me __________ sheknew me. I've never seen her before in my life.
---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.
--- How about going hiking this weekend? --- Sorry. I prefer _______ rather than _______.
The teacher asked the students ________.