1.we heard her … the piano. a) play b) to play c) played d) had played 2. they watched him … . a) to approach b) approach c) had approached d) approaches 3. i felt somebody … my shoulder. a) touch b) touching c) touched d) to touch 4.it is difficult to … the difference between the two cars; they are almost identical. a) say b) tell c) speak d) look

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