Keep up a good state of mind even if you _____ fail plenty of times.
— Tom, are you going swimming with us? — I’d love to, but something important has ______.
Can you make sure ______?
The sad mother ______ crying when the reporter asked about her son’s death.
Because the shop ______, all the T-shirts are sold at half price.
—What do you think of John? —He’s a good boy, but he ______ be really stubborn at times.