1) They ... a factory here three years ago. a) built b) have built 2) I ... a wild animal before. a) didn't see b) haven't seen 3) We ... to Egypt two months ago. a) went b) have gone 4) ... you ever ... about greenhouse effect? a) Did ... hear b) Have ... heard 5) They ... a new car last year. a) bought b) have bought 6) How many trees ... you ... so far? a) did ... plant b) have... planted 7) He ... never... money to organisations. a) gave b) has given 8) Scientists .... many planets and moons. a) discovered b) have discovered 9) ... you ... a documentary on TV last night? a) Did ... watch b) Have ... watched

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