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
．What I like about Harvard is there’s the old classical look—there are parks and traditional buildings.
A．why B．where C．that D．how
With a lot of tough problems , the pilot was still calm, cool and collective under pressure.
A．solve B．solved C．solving D．to solve
left the door unlocked must be held responsible for the accident.
A．Whomever B．Whoever C．Whatever D．Whenever
If we use the new recycling method, a large number of trees .
A．are saved B．will save C．will be saved D．have saved
