________ River Nile is ________ longest river of all.
A.Ø / Ø
B.A / the
C.The / the
D.Ø / a

________ smog is ________ big problem in ________ big cities.
A.The / Ø / the
B.Ø / a / Ø
C.The / Ø / Ø
D.A / the / the

________ Women’s Day is on ________ eighth of March.
A.The / Ø
B.Ø / the
C.The / an
D.Ø / an

Peter has been ill for a week. He was taken to ________ hospital yesterday. He is in ________ hospital now.
A.the / a
B.Ø / Ø
C.an / an
D.the / an

________ atheist does not believe in ________ God.
A.The / the
B.An / Ø
C.Ø / the
D.An / a

Barack Obama used to be ________ President of ________ United States.
A.the / the
B.a / Ø
C.the / Ø
D.the / an

________ Mount Everest is in ________ Himalayas. It is ________ tallest mount in the world.
A.Ø / an / the
B.A / an / a
C.The / Ø / Ø
D.Ø / the / the

Lee, my classmate, comes from ________ Philippines. He not only plays ________ football very well but also is good at ________ mathematics.
A.Ø / Ø / the
B.the / a / the
C.Ø / the / the
D.the / Ø / Ø

Jim, ________ old friend of mine, used to work in ________ downtown Los Angeles. He had a good job in one of ________ biggest law firms in the city.
A.an / the / Ø
B.a / the / Ø
C.the / Ø / a
D.an / Ø / the

Trộn 250 ml dung dịch hỗn hợp HCl 0,08 mol/l và H2SO4 0,01 mol/l với 250 ml dung dịch Ba(OH)2 có nồng độ x mol/l thu được m gam kết tủa và 500 ml dung dịch có pH = 12. Coi các chất điện li hoàn toàn thành ion. Giá trị của m và x lần lượt là
A.3,495 gam và 0,12M.
B.0,5825gam và 0,06M.
C.5,825 gam và 0,6M.
D.3,495 gam và 0,06M.