5.-Will you please show me _____this new machine?
-It's a piece of cake.Now let me tell you what to do first.( )
-It's a piece of cake.Now let me tell you what to do first.( )
| A. | can I how operate | B. | I can how operate | ||
| C. | how can I operate | D. | how I can operate |
18.-Can I help you?
-Yes.I ______ this watch here yesterday,but it doesn't work.( )
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-Yes.I ______ this watch here yesterday,but it doesn't work.( )
| A. | buy | B. | bought | C. | will buy | D. | have bought |