Topics: Vocabulary
noun- a colorless, odorless, highly flammable gas, the chemical element of atomic number 1
A. hydroplane
B. hydrogen
C. hydrangea
D. hydraulic
Select your answer:

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Grammar › ViewWhat is the present participle form of the verb “catch”?
A. catching
B. catched
C. caught
D. catches
Infinitives or Gerunds › View
When a students asks a question, the teacher always tries …………………….the problem
A. to explain
B. explaining
