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`25.` They invested too little money into it, so the film failed.

`-` Clause, so + clause : vì vậy

`-` Quá khứ đơn : S + V ( ed/PI ) + O

`26.` Despite watching the documentary three times, she couldn't understand it.

`-` Despite + N/V-ing, clause : mặc dù ... nhưng

`27.` Because he was tired, he finished work late.

`-` Because + clause, clause : bởi vì

`28.` Despite the heavy rain, they went on a picnic yesterday.

`-` Despite + N/V-ing, clause : mặc dù ... nhưng