Little _____ that we were watching his every move, so he seemed to be going his own way in his business.
| A．he realized | B．he didn’t realize | C．didn’t he realize | D．did he realize |
Play, often _______ as an activity for young children, is still important in the social development of teenagers.
| A．to see | B．seeing | C．to be seen | D．seen |
Scientists generally agree that Earth’s climate will warm up over the next 50 to 100 years _________ it has warmed in the 20,000 years since the Ice Age.
| A．as long as | B．as much as | C．as soon as | D．as well as |
---Ring me at 7 a.m.?
---No, not that early! I _________.
| A．sleep | B．will sleep | C．am sleeping | D．will be sleeping |
________, more than 200 houses and buildings are heated by solar energy, not to mention the big cities.
| A．In the alone small town | B．In the small town alone |
| C．Alone in the small town | D．In the small alone town |
Results from a recent research indicate that ______ daydreaming is ______ means of relaxation.
| A．the; a | B．不填; the | C．a; the | D．不填; a |