在下面的表单中，添加两个单选按钮，名称均为“gender”。
<form>
<@(32) value="male"> Male
<@(32) value="female"> Female
</form>
<form>
<input type="radio" name="gender" value="male"> Male
<input type="radio" name="gender" value="female"> Female
</form>
<form>
<input type='radio' name='gender' value="male"> Male
<input type='radio' name='gender' value="female"> Female
</form>
<form>
<input name="gender" type="radio" value="male"> Male
<input name="gender" type="radio" value="female"> Female
</form>
<form>
<input name='gender' type='radio' value="male"> Male
<input name='gender' type='radio' value="female"> Female
</form>