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) are trying a) was trying b) were trying c) had been trying d) had tried 12) meet a) met b) meeted c) had met d) have met 13) had learnt a) learnt b) have learnt c) had learnt 14) take a) took b) taken c) had taken 15) has done a) had done b) have done c) did d) had did

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