1) That bird ____ be a penguin. It flew onto the roof. a) could b) can't 2) Our dog hasn't moved all day. He ____ be ill a) could b) can't 3) Be careful. I can hear a mosquito. It ____ bite you. a) must b) might 4) Something is eating food from the bins. There aren’t any wolves around here, but it _____ be a fox. a) can't b) could 5) It’s big and it’s got brown fur. It ____ a bear. a) can't b) might 6) It's got four legs, so it ____ be a snake. a) can't b) could 7) I can hear a voice speaking, but there’s nobody here. It _____ be that parrot! a) can't b) must 8) Look at that hole on the wall. I think we _______ have a mouse in the house. a) can't b) might 9) I can hear a dog barking. That ______ be my neighbour's dog. a) must b) can't 10) This fish smells terrible. It ______ be fresh!!! a) might b) can't

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