Choose the answer among A, B, C, D to complete each of the sentences below:
Scientists say that the main reason ______ population explosion is an increase in birth rates.
A.of
B.for
C.to
D.in

Choose the answer among A, B, C, D to complete each of the sentences below:
The World Cup is a football ______ which is open to all countries.
A.occasion
B.participation
C.involvement
D.competition

Choose the answer among A, B, C, D to complete each of the sentences below:
They have no money and are forced to live on ______.
A.fund
B.saving
C.donation
D.charity

Choose the answer among A, B, C, D to complete each of the sentences below:
We should develop such...... sources of energy as solar energy and nuclear energy.
A.surprising
B.revolutionary
C.alternative
D.tradition

Choose the answer among A, B, C, D to complete each of the sentences below:
Jane is going to go abroad next month and she's having a ________ party on Sunday.
A.birthday
B.wedding
C.anniversary
D.farewell

Choose the answer among A, B, C, D to complete each of the sentences below:
The government has spent £1 million on an advertising ______ to encourage energy conservation.
A.operation
B.campaign
C.promotion
D.enterprise

Choose the answer among A, B, C, D to complete each of the sentences below:
We could make better ______ of our energy resources.
A.need
B.limit
C.use
D.spend

Choose the answer among A, B, C, D to complete each of the sentences below:
The novel is based on his ________ in the war.
A.experiences
B.situations
C.attitudes
D.images

Choose the answer among A, B, C, D to complete each of the sentences below:
People believed that what they do on the first day of the year will _______ their luck during the whole year.
A.influence
B.exchange
C.control
D.result

Choose the answer among A, B, C, D to complete each of the sentences below:
They volunteer to take care of children who have been ______ by the AIDS epidemic.
A.orphaned
B.left
C.supported
D.suffered