________ can be good at something for 40 years if he doesn’t love it. (2013·江西,23)
----I ____ to a party, but I’ve got nothing to wear. ---- Why don’t you have a dress made for the party?
He was born in a musical family, but he cannot play any ______.
On the graduation day, he received from his father a nice present ______ a note was attached, saying “I’m proud of you.”
We should do what we can to save those _____ species, including the tiger, an animal which was considered _____ to humans.
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure. A. can; mustB. can; may . must; can D. may; must