Complete each of the following sentences with the correct fo

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Complete each of the following sentences with the correct form of the words given below.

1,I lost my keys and could not ___ the door.(lock)

2,Mary was already an______-primary school teacher at the age of 25.(experience)

3,Their lives were frequently______by gas explosion.(threat)

4,The first American ______ of this opera was in 1926.(perform)

5,The boy is______ to have had the help and guidance of such a learned uncle.(fortune)

6,You will increase your______ if you introduce more system into your work.(efficient)

7,If you use this chemical to clean your shirt,the stains will ______ immediately.(appear)

8,John and Mary had a______ ,but they have made it up now.(understand)

9,The children looked wonderfully______ with their bright eyes and glowing cheeks.(health)

10,Looking up,I saw his eyes fixed on me in______ .(curious)

unlock

experienced

threatened

performance

fortunate

efficiency

disappear

misunderstanding

healthy

curiosity