He explained________why he didn’t come to our party yesterday.
It’s reported that a tiger escaped _______ the zoo yesterday.A. in B. on C. from
The work is so difficult that I don’t know _______ to do it.A. what B. how C. where
If I _______ you, I would stop looking for it.A. am B. being C. were
— Who taught _______ French? — Nobody. She learned all by _______.A. herself; herB. she; herselfC. her; herself
Tony’s sister is _______ to take care of the little baby.A. careful enoughB. enough carefulC. enough carefully