Do you mind if I open the window?
___
A of course not B yes, you may
C no,go ahead D A or C

Tom without his parents lay on the ground wiht his eys____
A looking at the stars B look at the stars
C to look at the stars D looked at the stars

We can start the work next week____
A if it is necessary B if necessary
C When it is necessary D all of the above

Do you mind if I open the window?
___
A of course not B yes, you may
C no,go ahead D A or C
选d,mind一词表介意反对, 如选b,前后矛盾.所以选d,

Tom, without his parents ,lay on the ground with his eyes____
A looking at the stars B look at the stars
C to look at the stars D looked at the stars
with+名词+分词,独立结构,当名词是人体部位时,如动词是及物的用过去分词,时不及物是 用现在分词.本题look时不及物动词,用v+ing形式.所以选a;

We can start the work next week____
A if it is necessary B if necessary
C When it is necessary D all of the above 选d,b是a的省略,c,when既有表时间也有表条件的意义,本题表时间也可以.所以选d.