infinitives & -ing forms
Unfortunately, I don't remember __________ (see) these chemical terms before.
SEEING
We visited the plant. Ammonia is produced there.
WE VISITED THE PLANT WHERE AMMONIA IS PRODUCED.
Edward Teller (mustnt / can't)______________ have seen hydrogen developments in the 90´s. He was already dead.
CAN'T
Over twenty million __________ watched last night's football match.
(audience - viewers - spectators)
VIEWERS
Ammonia is easily stored in _____as a liquid at modest ____________
BULK PRESSURES
It was really nice of you __________ (remember) my email. I didn't expect it.
TO REMEMBER
That's a full cell. Its properties represent several uses.
THAT'S A FULL CELL, WHOSE PROPERTIES REPRESENT SEVERAL USES.
Dynos (can / must)___________ have been extinguished by an asteroid. There´s plenty hard evidence.
MUST
david bought twenty lottery tickets last night, in the hope that he will __________ the jackpot.
(win - gain -earn)
WIN
There is an existing _________ network, in which ammonia is stored in large __________tanks
DISTRIBUTION REFRIGERATED
Green hydrogen can eventually stops __________ (pollute) our air.
POLLUTING
Carrying Ammonia is a process . Many people in companies work with.
CARRYING AMMONIA IS A PROCESS WHICH MANY PEOPLE IN COMPANIES WORK WITH.
Net zero agreement (may / could)___________ have been accurate in time, but we don't know yet.
MAY
Wind is the __________ renewable source ; when it comes to green energy.
(normal - typical - common)
TYPICAL
Ammonia can be burnt in an ___________ or used in a fuel _____ to produce electricity
__________ (cycle) is a great way to avoid gas emissions in our routine.
CYCLING
Haber and Bosch had never visited our town. They won a recognition for their process.
HABER AND BOSCH, WHO WON A RECOGNITION FOR THEIR PROCESS, HAD NEVER VISITED OUR TOWN.
Companies' experts (might not / needn't)_________ have met last Monday. After all, it was not a must. Everybody was tired after then.
NEEDN'T
I can't stand the __________ of spiders!
(sight - scene - image)
SIGHT
However, hydrogen is difficult and expensive to store needing cryogenic _______or high-pressure ________
TANKS CYLINDERS
I'm sorry but I am not willing __________ (risk) any money in the stock market.
TO RISK
I spoke with the researcher. He was able to help me.
THE RESEARCHER WITH WHOM I SPOKE WAS ABLE TO HELP ME.
You (may / ought to) have informed us earlier about the change of plans.
OUGHT TO
You shouldn't get disappointed when a problem __________.
(rises -raises - arises)
ARISES
The d_______________ to this technology is the high greenhouse gas emissions
DOWNSIDE