1.he ()carefully ,but he ()nothing.A listen ,hear B listen ,
1.he ()carefully ,but he ()nothing.A listen ,hear B listen ,heard C listened ,hear
D listened ,heard
2.if you don't ()carefully ,you can't ()the sound.
A hear ,listen B listen ,listen to C hear ,hear D listen ,hear
D listened ,heard
2.if you don't ()carefully ,you can't ()the sound.
A hear ,listen B listen ,listen to C hear ,hear D listen ,hear
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