On hearing that she failed the entrance exam, Trang couldn’t help ____ into tears.

A. bursting

B. burst

C. to bursting

D. to burst

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Human beings have destroyed the environment for a long time. They are now paying a high price for this.

A. Because having destroyed the environment for a long time, human beings are now paying a high price for this.

B. Having destroyed the environment for a long time, human beings are now paying a high price for this.

C. On destroying the environment for a long time, they are now paying a high price for this.

D. After being destroyed for a long time, the environment is now paying a high price.

Cho tam giác ABC vuông tại A, có BC = a, AC = b, AB = c. Giải tam giác ABC, biết:

a, a = 15 cm, b = 10 cm

b, b = 12 cm, c = 7 cm