It was Alice and her husband who sent the old man to the hospital, _______?[ ]

Though he lost the race, hehimself to be a good driver to the audience（观众）.

I have a lot of homework to do today, _________ I cannot go swimming with you.

ilure in the exam was expected________, it was still very disappointing

The robot needs _______ once a month. And we will check it for you for free.