We __________ the old scientist __________ his contribution ________ the country.
— Have you thought of a theme for your poster yet? — No, I ______ a lot about it, but I haven’t decided.
______ left before the deadline, it doesn’t seem likely that John will finish the job.
Medical ______ shows that men are more likely to have heart attacks than women.
Several years had passed ______ I finally realized the true value of friendship.
It’s a mistake to think of Chongqing only ______ its tourist attractions.