[单项选择]In winter drivers have trouble stopping their cars from ______ on icy roads.
A. skating
B. skidding
C. sliding
D. slipping

[单项选择]In winter drivers have trouble stopping their cars from __________ on icy roads.
A. skating
B. skidding
C. sliding
D. slipping

[单项选择]You can never imagine what great trouble I have had ______ the patient who received a serious wound.
A. treat
B. to treat
C. treating
D. treated

[单项选择]

You’re in trouble if you have to buy your own brand-name prescription drugs. Over the past decade, prices leaped by more than double the inflation rate. Treatments for chronic conditions can easily top $2,000 a month -- no wonder that one in four Americans can’t afford to fill their prescriptions. The solution A hearty chorus of "O Canada." North of the border, where price controls reign, those same brand-name drugs cost 50 % to 80 % less.
The Canadian option is fast becoming a political wake-up call. "If our neighbors can buy drugs at we " Even to whisper that thought provokes anger. "Un-American! And -- the propagandists’ trump card (王牌) -- "Wreck our brilliant health-care system." Supersize drug prices, they claim, fund the research that sparks the next generation of wonder drugs. No skyhigh drug price today, no cure for cancer tomorrow. So shut up and pay up.
Common sense tells you that’s a false alte
A. A quarter of Americans can't afford their prescription drugs.
B. Many Americans can't afford to see a doctor when they fall ill.
C. Many Americans have to go to Canada to get medical treatment.
D. The inflation rate has been more than doubled over the years.

[单项选择]Sometimes children have trouble fact from fiction and may believe that such things actually exist. __________.
A. to separate
B. separating
C. for separating
D. of separating

[单项选择]When did the plane have a trouble


A. During her visit in Cairo.
B. After she finished her visit.
C. When it was preparing to take off.
D. After it took of

[单项选择]There is abundant evidence that cars have a harmful effect on the environment.
A. dear
B. sufficient
C. strong
D. obvious

[单项选择]Sometimes very young children have trouble （） fact from fiction and may believe that such things actually exist.
A. separating
B. having separated
C. to separate
D. for separating

[单项选择]Since the energy crisis, these big cars have become a real liability. They cost too much to run.
A. lack of reliability
B. substitute
C. costly means of transport
D. disadvantage

[单项选择]Did you have trouble （） the swimming pool.
A. to have found
B. to find
C. with
D. in finding