Why were you so late this morning—I _____ in heavy traffic for an hour on the way here.

I wonder _______ he persuaded his father to give up smoking.— He showed him pictures of lungs damaged by cigarettes. [ ]

, she does get angry with him sometimes.

I think food in Chongqing is much hotter than __________ in Shanghai.

Don’ t worry. A number of efforts are being made ______ the whole system operating normally.