How often do you visit your grandparents?
To pass the driving test, Alice had a busy month __________ driving the car.
We do have the most supportive parents and teachers, ________will make a difference to our study, unless all of us make every effort .
Only when __________ senior high school __________ to show a great interest in poems.
---Why are you still here? Everybody has gone to attend the lecture by the president.--Oh, I ___________ about it!
Mr. Duncan raised an unnecessary question __________ he then failed to find an answer.