1) I haven't seen you ...................... 3 weeks a) for b) since c) yet 2) Mr Smith has lived here ............ I was young. a) for b) after c) since 3) I........................... (watch) TV since 9:00 Am. a) watch b) watched c) have watched 4) Sara .................... the room for 5 hours. a) clean b) has cleaned c) cleaned 5) Correct the mistake. They hasn't answered the activity yet.  a) haven't b) has c) have

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