Câu hỏi: When a lion gets hungry, its manner changes and it becomes threatened.

A. when

B. its manner 

C. and

D. threatened

Câu 1: Passengers are required to arrive to the gate fifteen minutes before departure time.

A. are required

B. to arrive to

C. before

D. departure time

Câu 2: I was very busy lately since the project of designing the new collection started.

A. was

B. since

C. the project

D. the new collection

Câu 3: I clearly remember to tell you about this before.

A. clearly

B. remember

C. to tell 

D. about

Câu 4: The Great Pyramid of Giza is said to have built over a 20-year period.

A. of

B. said

C. have built

D. a

Câu 5: Little he knows about the surprise that awaited him.

A. he knows

B. about

C. the

D. awaited

Câu 6: By measuring the color of a star, astronomers can tell how hot is it.

A. measuring

B. the

C. how

D. is it