Choose the answer among A, B, C, D to complete each of the sentences below:
Many university students _______ spent their summer vacations teaching illiterate people to read and write.
A.voluntarily
B.freely
C.consciously
D.gradually

Choose the answer among A, B, C, D to complete each of the sentences below:
Shortly after receiving her gold medal, the Olympic champion answered questions at the press _____.
A.assembly
B.conference
C.discussion
D.seminar

Choose the answer among A, B, C, D to complete each of the sentences below:
Vietnamese people usually make _______ for Tet several weeks beforehand.
A.preparations
B.preparing
C.preparatory
D.preparation

Choose the answer among A, B, C, D to complete each of the sentences below:
I don't have much money, so I bought the camera _____.
A.second-hand
B.profitably
C.immediately
D.newly

Choose the answer among A, B, C, D to complete each of the sentences below:
________ is produced from the heat stored in the earth's core.
A.Solar energy
B.Nuclear energy
C.Water energy
D.Geothermal energy

Choose the answer among A, B, C, D to complete each of the sentences below:
We offer a very _____ rate for parcels of under 15 kg.
A.competitive
B.competing
C.competition
D.competent

Choose the answer among A, B, C, D to complete each of the sentences below:
Tet is really a time of fun and _______ throughout the country.
A.festivals
B.holidays
C.preparations
D.celebrations

Choose the answer among A, B, C, D to complete each of the sentences below:
Football, rugby and baseball are the most popular ______ sports in Britain.
A.spectator
B.amateur
C.watcher
D.looker

Choose the answer among A, B, C, D to complete each of the sentences below:
He is a great _____ of Picasso's early paintings.
A.admirer
B.admiring
C.admire
D.admiration

Choose the answer among A, B, C, D to complete each of the sentences below:
The government has launched a ______ aimed at educating young people about the dangers of drugs.
A.struggle
B.campaign
C.combat
D.program