You _____ be 18 years old before you are allowed to drive a car ,and it’s also essential to get a driver’s license
Great attention must be paid __________ welfare, especially in the poor area.
—When did you last hear __________ Jay?—He phoned me this morning, and we agreed __________ a time and place to meet.
The reason why he was late for school this morning is __________ his bike broke down on his way to school.
I didn't want to go with him, so I invented a (n) __________ about things I had to do on Friday.
"The final exam is coming. You'd better concentrate ___________ your study. " Mother informed me __________ it.