Choose the correct word to complete the sentences.
In some countries, water has to be boiled to ______ it.
A.purity
B.pure
C.purify
D.purely

I’m studying medicine. I want to ________ in genetics.
A.specialize
B.specialist
C.special
D.specially

The city council should ______ this road.
A.wide
B.widen
C.widely
D.widened

The time we spent apart only _____ my love for him.
A.strength
B.strong
C.strengthened
D.strongly

The plant’s plans will _________ thousands of lives.
A.danger
B.endanger
C.dangerous
D.dangerously

Could you _______ your name here, please?
A.signing
B.signal
C.signature
D.sign

His speech was too long. He should have ______ it.
A.short
B.shorten
C.shortened
D.shortly

He always thinks he's right. He never ______ for his mistakes.
A.apologies
B.apologise
C.apology
D.apologizes

Tony had little difficulty in passing the examination, ....he has a very good foundation in English.
A.since
B. as
C.for
D.because

.... you are over 18, you can join the army.
A.As long as
B.Due to
C.Because of
D.On account of