—Where did you get this book?—I picked it up from a second-hand bookshop if you ______know.
There is no doubt that a small child has to learn to keep its _________ before it can walk far.
The reason why Daisy eats so little is that she is _________ a diet and she is trying to _______ weight.
-Hello, Mr. Wang. Must we wear the school uniform tomorrow?-You ___________. Only on Mondays. Tomorrow is Tuesday.
The Curies were ___________ the Nobel Prize for their great contributions to science.
-Why haven’t you posted the letter?-I __________ to but I forgot about it.