Only when he reached the house ___ it was the same place he’d been in last year.
| A．he realized |
| B．he did realize |
| C．realized he |
| D．did he realize |
Standing on the top of the hill, one would not do anything, but _____ the flowing of the clouds around me.
| A．enjoy | B．enjoying | C．enjoyed | D．to enjoy |
The “magical apple”, which we wish not to be the last one_____ us, has inspired the imagination and passion of millions of people.
| A．fascinate | B．fascinating | C．fascinated | D．to fascinate |
Why the explosion occurred was ____ the laboratory attendant had been careless.
| A．for | B．because | C．since | D．that |
________ one foot before the other, slowly and purposefully, the deer walked up to ______ I was _______.
| A．Put, where, seated | B．Putting, the place where, seating |
| C．Put, the place in which, sitting | D．Putting, the place where, sitting |
This field of scientific research remains________.
| A．to be untouching | B．being touched |
| C．to be untouched | D．untouched |