________ he made up his mind to take a trip to Europe?
| A．When was it that | B．to That was it when | C．That it was when | D．When it was that |
The number of the students in our school ________ about 3000 and ______ them study hard.
| A．is, a large amount of | B．are, a number of |
| C．are, large amount of | D．is, a large number of |
Rather than ______ on a crowded bus, he always prefers _____ a bicycle.
| A．ride, ride | B．riding, ride | C．ride, to ride | D．to ride, riding |
He has devoted most of his time and energy _______ a cure for the disease.
| A．find | B．finding | C．to find | D．to finding |
The child asked his mother _______ go out to play tennis.
| A．that he could | B．if he could | C．if could he | D．that could he |