Please choose the correct sentences.<br/><br/>1.Is the sentence (1) correct?If not, please correct it.<br/><br/>2.Is the sentence (1) correct?If not, please correct that.<br/><br/>3.Is the sentence (1) correct?If not, please correct this.<br/><br/>If all are correct, what is their subtle difference in meaning in this context?<br/><br/>Q