Don’t waste your words any more; she is as ______ as a mule (骡子) and no one can persuade her.
With so many exercises ________, the students are having a hard time.
Whom do you expect to have ________ the baggage to the airport?
The airport is far from here, and ________ there on time, you'd better take a taxi.
The old couple walked rather slowly, and could be seen, from time to time, to stop and rest, ________ out to sea.
It was unbelievable that the fans waited outside the gym for three hours just________ a look at the sports stars.