John was amazed when the train arrived exactly____ time.
Education in many countries is compulsory________the age of 16.
The pool should not be made so deep______small children can be safe there.
It is stated in the passage that____________________ .
The Lake District,____________________ was made a national park in 1951, attracts a large number of tourists every year.
_______ has been a topic of continual geological research.
There has been a great increase in retail sales,_____________________ ?
The boat was sailing north when a terrible storm_____________ .
The phrase "keeps sellers on their toes" in the passage mostly means "______".
She asked me______I was looking at.
We all agree that she is____________________ student in our class.