As is known to us all,the age_____children can go to school is seven.

The aeroplane ____ she was traveling was delayed for three hours at least.

"Doesn't Elanine want to see that movie?" "Yes,but she says_______go tonight."

The time has come _____ we make extensive use of nuclear energy.

Mysisterwasn'tinParislastmonth,soyou_____herthere.