Many ecologists are concerned that the 'greenhouse effect' is cahnginkg many of the Earths---------weather pattern s into --------system unable to be accurately forecast by those who study them .

To flog a dead horse

Hand in glove

In the following question choose the altranative which best hexpresses the meaning of the idiom /phrase

A hard nut to crack

(1)it being very dark (2)the visitors found it difficulty

(3)to locate the switch (4) no error

In the following question some parts of the sentance khave errors .Find out which has error .the number of that part is the answer .If a sentance has no error then the ankswer is (4)