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用所给动词的适当形式填空. 1. 'Please be quiet. No _____ (talk)!' says our biology teacher. 2. Every day we practice _____ (speak) English with some Americans after school. 3. Did they have fun _____ (visit) Weifang yesterday? 4. Xiao Tao goes to the zoo _____ (see) the lovely pandas. 5. Can you help me _____ (make) dumplings?