—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
Barbara is easy to recognize as she's the only one of the women who ______ evening dress.
I,____ your friend, will try my best to help you out.
The number of people who __________ cars __________ increasing in China.
Every possible means __________ to save the wounded soldier up to now.
Not only I but also Jane and Mary __________ tired of doing the same thing all the time.