While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.
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.
In order to support his study, his brother can’t wait ______ money.
It’s always difficult to live in a foreign country, ______ when you don’t speak the language.