_____ the weather forecast, it will rain heavily later in the morning.

A. On account of

B. Due to

C. According to

D. Because of

The computer’s memory is the place where information _____ and calculations are done.

A. are kept

B. is kept

C. kept

D. keep

Tính hợp lí:

a, A =  1 + 2 + 2 2 + 2 3 + 2 4 + . . . + 2 99 + 2 100

b, B = 5 + 5 3 + 5 5 + . . . + 5 97 + 5 99