By.................... more about the tiger's habits, scientists can save them from extinction.
A.to learn
B.to learning
C.learning
D.learned

Easter is a joyful festival which is ........... in many countries. (celebrate)
A.celebrated
B.celebrating
C.celebration
D.celebrators

Tet is a ............... festival of the Vietnamese people. (joy)
A.joyless
B.joyfulness
C.joyfully
D.joyful

We often go to the town house. (culture)
A.culturally
B.cultural
C.culturist
D.culturing

The doctor_________me not to stay up too late at night.
A.advised
B.suggested
C.insisted
D.forced

After I_______ finished working, I switched off the machine.
A.had
B.have
C.to have
D.having

What does the passage mainly discuss?
A.The differences between early and modern comic strips.
B.A comparison of two popular comic strips.
C.Features of early comic strips in the United States.
D.The effects of newspapers on comic strip stories.

I had not expected the journey would be so long.
A.The journey was as long as I had expected
B.The journey was not longer than I had expected
C.The journey was not so long as I had expected
D.The journey would be longer than I had expected

What happened in that city were a reaction from city workers, including firemen and policemen who had been laid off from their jobs.
A.What happened
B.were
C.including
D.their

Plant cuttings who are placed in water will develop roots and can then be planted in soil.
A.who
B.placed
C.then be
D.in soil