A.The alarm clock would turn off forever.
B.You would have to wake up immediately.
C.Nothing would happen at all.
D.The alarm would stop, but go off again soon.

A.It is better at conversation.
B.It never has to stop.
C.It is more knowledgeable about coffee-making.
D.It can operate machinery.

A.Children have to walk longer distances to school.
B.The education system has got much worse.
C.Things aren’t as hard as they once were.
D.It hasn’t changed much at all.

A.Children have to walk longer distances to school.
B.The education system has got much worse.
C.Things aren’t as hard as they once were.
D.It hasn’t changed much at all.

A.
B.
C.
D.

A.
B.
C.
D.

A.4,32.
B.43,2.
C.21,6.
D.2,16.

A.xiđerit, hemantit đỏ, manhetit.
B.pirit, hemantit nâu, manhetit.
C.hemantit, pirit, manhetit.
D.xiđerit, manhetit, hemantit nâu.

A.glucozơ.
B.fructozơ.
C.mantozơ.
D.saccarozơ.

A.C + O2 → CO2.
B.C + H2O → CO + H2.
C.3C + 4Al → Al4C3.
D.C + 2CuO →2Cu + CO2.