He __________ well in the exam last week, so he __________ hard now.A. did, studied B. didn't, is studying C. didn't do, is studyingD didn't, studying
----What a nice bike! How long ____ you ____it? ----- Just two weeks.
When his wife died, he lived ______; his lovely pet dog made him feel less ______.
All the students know shouting at the elderly is impolite.
We can’t work out this problem. Can you tell us ______ ?
—Don't talk in the library. Always keep quiet here. —_________.