tìm lỗi sai

Due to the rain, a number of students was late for school last Monday

A.for

B.number of

C.was

D.due to

People known that vitamin C is good for treating colds

A.It is known that vitamin c is good for treating colds

B.Vitamin c is known that good for treating colds

C.It is good that vitamin c knows how to treat colds

D.People are known to treat cold with vitamin c

Did you often eat sweets when you were small ?

A.Were you used to eat sweets when you were small?

B.Did you used to eat sweets when you were small?

C.Did you use to eat sweets when you was small?

D.Were you use to eat sweers when you was small?

English is the first lanuage in many countries outside United Kingdom

A.outside

B.in 

C.first

D.United Kingdom