Choose the answer among A, B, C, D to complete each of the sentences below:
He built _____ his collection over a period of ten years.
A.up
B.on
C.into
D.in

Choose the answer among A, B, C, D to complete each of the sentences below:
If you want to send a document and do not want to lose, its original shape, our _____ service will help you.
A.messenger call
B.express mail
C.postal
D.facsimile

Choose the answer among A, B, C, D to complete each of the sentences below:
The Great Wall is China's most popular ______.
A.contribution
B.construction
C.attraction
D.impression

Choose the answer among A, B, C, D to complete each of the sentences below:
They're having a party in _______ of his 84th birthday.
A.ceremony
B.honor
C.memory
D.celebration

Choose the answer among A, B, C, D to complete each of the sentences below:
Oil, coal and natural gas are ______ fuels made from decayed material from animal or plants.
A.smokeless
B.fossil
C.unleaded
D.solid

Choose the answer among A, B, C, D to complete each of the sentences below:
He has...... extensive research into renewable energy sources.
A.cared for
B.carried out
C.turned on
D.taken over

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.preparation
B.preparatory
C.preparations
D.preparing

Choose the answer among A, B, C, D to complete each of the sentences below:
The singer was _____ on the piano by her sister.
A.performed
B.helped
C.played
D.accompanied

Choose the answer among A, B, C, D to complete each of the sentences below:
We have bought extra food ______ our friends stay to dinner.
A.in case
B.as long as
C.provided
D.if

Choose the answer among A, B, C, D to complete each of the sentences below:
There are some hobbies that I _____ in for a while besides reading and collecting.
A.indulge
B.occupy
C.accomplish
D.fascinate