Do you know if he________ to play football with us? —I think he will come if he _________ free tomorrow.

______ have you been learning English?—Since seven years ago．

It’s true that_____ you study, _____ your future will be.[ ]

The oral test counts 20 % _____ the final English exam.[ ]

Modern science has given ____clear evidence ____ smoking can lead to many diseases ____ it’s time for us to take measures.