If water becomes increasingly scarce in decades ______, water shortage will become a hot issue all over the world.
| A．coming | B．having come | C．to come | D．to be coming |
--- " ______ he open the door?"
--- "Yes, please."
| A．Shall | B．Will | C．Can | D．Would |
I will certainly be surprised if he ______ to tell them what he knows.
| A．dare | B．will dare | C．dared | D．dares |
______ you make a little room for me?
| A．Should | B．Could | C．May | D．Must |
I am told that her father is in London and ______ a dry-goods store.
| A．has kept | B．kept | C．keeps | D．had kept |
George has arrived, but I did not know he ______ until yesterday.
| A．comes | B．will come | C．is coming | D．was coming |