If you _____ the medicine you _____ better now.
The twins were so much alike; I could hardly ________ Tom.
By far, there are many problems ________ to be solved.
I don't think _________ possible to master a foreign language without much memory work.
The patient was warned ________ oily food after the operation.
Susan, _____ university student from European, teacher me _____ art in he spare time.