1.Do you know if Sally has arrived?是不是可以说成Do you know whethe

1.Do you know if Sally has arrived?是不是可以说成Do you know whether Sally has arrived or not?2.I’ve heard that you play in your school orchestra.中的that能否去掉?3.I know that foreigners find China very different from their own countries.中的that能否去掉?4.What lessons are you going to ( ) next term?A.take B.make C.find D.get5.as a result 在句子中时,前面和后面是否都需要逗号隔开?6.What does it （feel like）to be at school in China 7.I buy the magazines when they come out each months.这个句子是哪种句式啊（主过从过的那些）