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in 2. – I’ m tired and don’ t feel well. – Oh, you should stop _________ and a good rest. A. to work B. working C. work D. works 3. – ________ is the elephant? – It is about 3 meters high and it weighs about 2 tons. A. How long B. How big C. How high D. How tall 4. – Where is Tom? – He __________ playing basketball on the playground. A. is seen B. saw C. be seen D. was seen 5. In the 1960s, a lot of old city walls in Beijing _______ because people thought them useless. A. pull down B. have pulled down C. were pulled down D. had pulled down 三.按要求完成下列句子 hope they can visi