Choose the letter A, B, C or D to complete the sentences

He said he _______ see his brother the next day.

A. ought to

B. should

C. would

D. must

Choose the right word to fill in the blank.

All flights to New York tomorrow will be _______ because of bad weather.

A. delayed

B. soon

C. late

D. early

She looks tired. What’s the ________________ with her?

Cho hàm số y = e x . Khi đó đạo hàm bậc 2 của hàm số là

A. y ' ' = e x 2 x 1 − 1 x .

B. y ' ' = e x 2 x 1 + 1 x .

C. y ' ' = e x 4 x 1 − 1 x .

D. y ' ' = e x 4 x 1 + 1 x .