By the end of this year, we _____ 2000 English words.
I can't remember when exactly the Robinsons left _____city, I only remember it was ______ Monday.
We expect her to do the housework as well _________ after the children.
I’d appreciate _____ if you would like to teach me how to use the computer.
It was not until dark ______ he found that it was the correct way to solve the problem.
----Do you doubt _______ she can run the race? ---- Yes, I doubt _______ she can run against Liu Xiang