Not to worry buddy I will let you know structure section of TOEFL exam so that you can have idea and prepare hard.

The Structure section contains sentences that test your knowledge of important structural and grammatical elements of standard written English. These sentences include a variety of topics and give no particular advantage to individuals in any specific field of study.

Here I’m telling you about the section

Structure
Directions: Questions 1–4 are incomplete sentences. Beneath each sentence you will see four words or phrases, marked A, B, C and D. Choose the one word or phrase that best completes the sentence. Then, on your answer sheet, find the number of the question and fill in the space that corresponds to the letter of the answer you have chosen.

Look at the following examples:
Example I
Geysers have often been compared to volcanoes _______ they both emit hot liquids from below the Earth's surface.
due to
because
in spite of
regardless of

The sentence should read, "Geysers have often been compared to volcanoes because they both emit hot liquids from below the Earth's surface." Therefore, you should choose answer B.

Example II
During the early period of ocean navigation, ________ any need for sophisticated instruments and techniques.
so that hardly
where there hardly was
hardly was
there was hardly

The sentence should read, "During the early period of ocean navigation, there was hardly any need for sophisticated instruments and techniques." Therefore, you should choose answer D.
PRACTICE QUESTIONS

1. Refrigerating meats ________ the spread of bacteria.
retards
retarding
to retard
is retarded

2. Throughout the animal kingdom, ________ bigger than the elephant.
whale is only the
only the whale is
is the whale only
only whale is the

3. The fact ________ money orders can usually be easily cashed has made them a popular form of payment.
of
that
is that
which is

4. The first article of the United States Constitution gives Congress ________ to pass laws.
the power
has the power
the power is
of the power

Address:-
ETS
ETS Ewing Office
225 Phillips Boulevard
Ewing, NJ 08628 USA

Phone:-
1-609-921-9000