giải dùm mik với ạ,giải thích vì sao chọn đáp án đó lun ạ

1.The girl...you visited last month is a famous scientist

A.what   B.whose     C.which   D.whom

2.Ba's house,...has been decorated many times,now looks like a new one

A.whose       B.who   C.that    D.which

3.The picture at.... she was looking was beautiful

A.who    B.which        C.that     D.what

4.The girl ....you've just talked to is my youngest sister

A.whose     B.which    C.ko điền gì hết          D.what

5.The students...last week are lazy

A.punished          B.are punishing            C.were punished       D.who were punishing

6.Nam was the last person..the classroom

A.to leave   B.leave    C.leaving           D.left

the man ..the bank is the manager

A.entering

B.is entering 

C.who entering

D.entered

2.Fil in the blank with the words ...in the box

A.giving

B.given

C.to give

D.to be given

1.I want to thank the people ...helped me to finish the report

A.whom

B.whose

C.who

D.which

2.You are the first person ..me today

A.visiting 

B.to visit

C.visited

D.visit

She / new hairstyle/ has /a in blue / red and new clothes /and / in terrible colours

giải phương trình: sin² \(\left(x-\dfrac{\pi}{4}\right)\)\(=cos^2x\)

giải phương trình : sin² 2x=\(\dfrac{1}{2}\)