1 Arrive at the classroom well before the test ____ so you d

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1 Arrive at the classroom well before the test ____ so you dont feel rushed,
A beginning B has begun C will begin D begins
2 It is desirable that water used for drinking _____ pure.
A were B should be C is D ought to be

第一题就是一般现在时啊.
第二题主要是两个的区别
1．ought to & should 意思大致相同,但有细微差别
ought to 多反映客观情况,表示根据法律,义务”应当”,比should 语气强
should 表示主观看法,一种建议,劝说
2．ought to 当应该讲时,比should 语强．当必须讲时,没有must语气强
3．ought to的否定式
needn't 表示某动作或事情没有必要做
oughtn't to 表示某动作或事情是错误的于 shouldn't 大体一致,但语气更强
4．表示可能性,推测）可能,该等意思时,两者的意思相同
I think they shoule/ought to be there by now.
我想他们现在改在那里了．

1 Arrive at the classroom well before the test ____ so you d 英语语法问题1.Arrive at the classroom well before the test ______ To do well on the test,____. Please look at the ____,before you take the medicine. They ____ (arrive) at the airport on time so that they can c ___the windows before you leave the classroom. — It is so hot in the classroom. Would you mind ____ the win He's the first ____(arrive) at the station You will never arrive at ____ is considered the Heaven on th this is the classroom ____ i used to study before ____ at the door before entering,please _________turn off the lights before you leave the classroom?