Sam is a _________ swimmer. He can swim very ________.
–I think students should have mobile phones to call their parents. - _____. They often use them to play games instead.
–What did the radio say just now? - Sorry. I didn’t catch it. I _____ something else.
– Mum, do you know if Dad _____ a model plane for me? - I think he will do if he _____ free.
Last month, doctors used a 3-D printer to rebuild the face of a person ____ had a bad accident.
- Shall we climb Nanshan this weekend? - Good idea! It’s not high. It’s about _____ high.