1.______ excuse Tom makes will not be believed because he always tells lies.
A. No matter what B. Whatever C. No matter how D. However
2. Lily’s father was worried about _____ she could take good care of herself when visiting the 2010 Shanghai World Expo.
A. if B. where C. whether D. that
3.We laugh at jokes, but seldom _____about how they work.
A. we think B. think we C. we do think D. do we think
