1. ---I apologized for_____ to tell you when and where the meeting will be held in advance.
A. my being not able B. me not to be able
C. my not being able D. me to be not able
1. Most birds find it safe to sleep in the trees, but _____ they have eggs or young chicks, they don’t use a nest.
A. why B. how C.unless D. where
1. ---What were you doing when Tom came to see you?
---I had just put on my overcoat and_____ to visit my friends.
A. left B. was left C. was leaving D. had left
1. As ______along the river bank, she was singing a pop song.
A. walking B. walked C. to walk D. walk
1. _____ is known to everybody, Taiwan is part of China. We must unify it.
A. It B. As C. That D. What
1. ---I rang you yesterday afternoon. A man answered, but I didn’t recognize the voice.
--- Oh, it ____ my uncle. He was in my room then.
A. must have been B. should have been C. must be D. should be
