1) They ... singing. a) are b) is c) isn’t d) aren’t 2) They ... climbing. a) is b) am c) are d) aren’t 3) I ... cooking. a) is b) am c) isn’t d) are 4) Billy ... diving.  a) is b) am c) aren’t d) are 5) She ... jumping.  a) is b) are c) isn’t d) am 6) He ... fixing his bike. a) is b) aren’t c) am not  d) are 7) He ... singing. a) aren’t b) isn’t c) is d) am 8) They ... jumping. a) isn’t b) are c) aren’t d) is 9) I ... sleeping. a) am not b) isn’t c) aren’t d) am 10) He ... riding a bike. a) aren’t b) am c) are d) is 11) He ... acting. a) am b) are c) isn’t d) is 12) She ... singing. a) are b) is c) isn’t d) am not 13) We ... flying. a) aren’t b) is c) am d) are 14) You ... writing a letter.  a) aren’t b) are c) is d) isn’t

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