What _______ public is concerned about is whether medical workers and scientists will be able to find _______ cure for this new disease after the vaccine is tried on _______ volunteers.
People have always been curious _________ how living things on the earth began.
I really don’t think my best friend will be angry, but I’11 go and see her,in case she _______.
--It was 3 o'clock_______we arrived at the village. --Oh,it was also at 3 o’clock______we arrived at the village.
Paris is________most beautiful city,where you can see_______famous Eiffel Tower.
If there were no examinations, we should have ___ at school.