--You should have thanked her before you left.
--I meant ________, but when I was leaving I couldn’t find her anywhere.
A. to do B. to C. doing D. doing so
Many people are ________ as to what to do when there is a fire.
A. at a loss B. at risk C. at ease D. at a distance
Girls used to take fewer advanced math courses than boys but now they are taking just _______.
A. as much B. so much C. as many D. so many
If we had taken such effective measures much earlier, the river ________ so seriously now.
A. is not polluted B. would not be polluted
C. had not been polluted D. would not have been polluted
More and more attention has been drawn to the fact that many children are ________ in the countryside when their parents flood into the cities for jobs.
A. left off B. left aside C. left out D. left behind
--How did you find your visit to Qingdao, Joanna?
--________.
A. Oh, wonderful indeed B. I went there alone
C. First by train and then by ship D. A guide showed me the way
