All the words are taken from Cambridge IELTS readings. Meanings and examples are taken from Cambridge dictionary website.

• resemble

to look like or be like someone or something:

You resemble your mother very closely.
After the earthquake, the city resembled a battlefield.

More examples
The overlapping slates of the roofs in the mountain village resembled fish scales.
His latest sculpture resembles an enormous seashell.
That actor really resembles my brother-in-law.
The finished model should resemble the one in the picture.
The twins resembled each other more strongly when they were young.

• crucial

extremely important or necessary:

a crucial decision/question
Her work has been crucial to the project’s success.
[ + that ] It is crucial that the problem is tackled immediately.

More examples
Price will be a crucial factor in the success of this new product.
The motif of betrayal and loss is crucial in all these stories.
The turning point in her political career came when she was chosen to fight a crucial by-election.
During the trial, the prosecution was accused of withholding crucial evidence from the defence.
The Panama Canal provides a crucial shipping link between the Atlantic and Pacific oceans.

• apparent

able to be seen or understood:

Her unhappiness was apparent to everyone.
[ + that ] It was becoming increasingly apparent that he could no longer take care of himself.
I was on the metro this morning when, for no apparent reason, the man opposite me suddenly screamed.

synonyms

easy to see, recognize, or understand
obvious = It’s obvious that she’s upset.
clear = It was clear that he was unhappy.
apparent = Her joy was apparent to everyone.
plain = His disappointment was plain to see.
evident = The company president was impressed by her evident ambition.
manifest = His manifest lack of interest has provoked severe criticism.

seeming to exist or be true:

There are one or two apparent discrepancies between the two reports.
She has this apparent innocence which, I suspect, she uses to her advantage.

• deficit

the total amount by which money spent is more than money received:

The country is running a balance-of-payments/budget/trade deficit of $250 million.
The UK’s deficit in manufactured goods fell slightly in the last three months.

Synonym shortfall
Opposite surplus

More examples

There are many priorities, but reducing the budget deficit is paramount/is of paramount importance.
By late in the first half United were staring at a seven-goal deficit and almost certain defeat.
The UK trade deficit widened/narrowed last month.
The government claimed they were doing a good job of reducing the country’s trade deficit and balancing the budget.
The deficit has been rising in recent years because of a drop in earnings from oil, the country’s main export.

• detrimental

causing harm or damage:

These chemicals have a detrimental effect/impact on the environment.
Their decision could be detrimental to the future of the company.