Sam with his friends every weekend．（ ）
A．skatesB．is skating
C．has skatedD．was skating
﹣﹣﹣What a great thing to have a robot at home!
﹣﹣﹣Robots are really useful．One day they will help people do almost﹣﹣﹣﹣﹣﹣﹣．（ ）
A．somethingB．everythingC．nothing
﹣﹣﹣The milk shake tastes good．How do you make it？
﹣﹣﹣It's easy，just follow the______．（ ）
A．discussionsB．instructions
C．resolutions
﹣﹣Do you know zongzi in traditional in China，Li Ping？
﹣﹣Usually during the Dragon Boat Festival．（ ）
A．why people makeB．when people eat
C．where people buy
If all business goes paperless，at least one million tons of paper a year．（ ）
A．are savingB．will be saved
C．were saved
﹣I'm feeling much better．Must I go on taking the medicine，doctor？
﹣No，you________．You'll get well soon．（ ）
A．can'tB．mustn'tC．needn't