1) is cleaning a) was cleaning b) cleaned c) was clean d) were cleaning 2) sing a) sung b) sang c) was sing d) was singing 3) is a) were b) are c) did d) was 4) are a) was b) did c) were d) is 5) has seen a) saw b) had seen c) has been seen d) had saw 6) visited a) had visit b) has visit c) has visited d) had visited 7) saw a) had saw b) had seen c) was seen d) was saw 8) did a) have done b) has done c) was did d) had done 9) will a) would b) was will c) did will 10) can a) was can b) did can c) could 11) have to a) had to b) did have to c) has to 12) are trying a) was trying b) were trying c) had been trying d) had tried 13) meet a) met b) meeted c) had met d) have met 14) had learnt a) learnt b) have learnt c) had learnt 15) take a) took b) taken c) had taken 16) has done a) had done b) have done c) did d) had did 17) was a) were b) had been c) did d) have been 18) were a) was b) had did c) had were d) had been

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