Lifting off at sunrise, the hot air balloon goes wherever the wind blow.
A．may B．must C．need D．should
—Where on earth have they gone?
—I have no idea, but I wish I .
A．know B．knew C．would know D．would have known
When Thanksgiving Day is the corner, stores and supermarkets are busy with people.
A．around B．on C．with D．at
The part in the film the man broke down the door made some of the audience give a cry.
A．which B．who C．where D．whom
More than a quarter of the energy in the United States goes to moving people and goods from one place to another.
A．using B．used C．to use D．use
—The battery in my cell phone is running low.
—I that last night before we went to bed.
A．was noticing B．have noticed C．would notice D．had noticed
