—Who______ it be that is knocking at the door?—It ______ be Father, but I’m not sure.A. can; must B. can; may . must; can D. may; must
13.With the car________down halfway on the road, we had great difficulty walking home in the snow.
12.---Honey, which movie should we watch tonight? ---I don’t mind which movie it is__________there’s popcorn and soda.
11.After I became the manager, few occasions could I find________I have the time to sit down and enjoy a quiet dinner with my wife.
10.I wrote emails to my sister and brother last week. To my disappointment,_____of them wrote me back.
9.You can depend on it that she will come to the wedding. ______, she’s accepted your invitation.