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TOEFL Grammar - Choose the right word

ScottsEnglishScottsEnglish Administrator Posts: 1,296 admin ✭✭✭✭✭✭✭
in TOEFL Test

Choose the correct word for the following sentence:

Certain chemicals, such as pure sodium, will _____________________ fire when exposed to oxygen in the air..

A. catch up
B. catch in 
C. catch of
D. catch on

Click here for the correct answer:

Certain chemicals, such as pure sodium, will catch on fire when exposed to oxygen in the air.

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