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( )16. It’s a good idea_______ hands with him when you meet Tom at the first time.
A. shake B. shakes C. shaking D. to shake
( )17. It _______ me 2 hours to do my homework last night.
A. cost B. spent C. took D. paid
( )18. -_____ is Mary ? -I think she’s gone to the library. She’ll be back in a minute.
( )16. It’s a good idea_______ hands with him when you meet Tom at the first time.
A. shake B. shakes C. shaking D. to shake
( )17. It _______ me 2 hours to do my homework last night.
A. cost B. spent C. took D. paid
( )18. -_____ is Mary ? -I think she’s gone to the library. She’ll be back in a minute.