Children who are not active or__________diet is high in fat will gain weight quickly.
| A．what | B．whose | C．which | D．that |
Most of us think of games as child* s play, but games _____ children' s thinking and develop skills like problem solving and communication．
| A．sharpen | B．seize | C．adore | D．apply |
In a courtroom it is sometimes difficult to ______ who is innocent and who is guilty．
| A．distribute | B．develop | C．design | D．distinguish |
Future will be a marvelous world of artificial ______----- robots might have their emotions and we human beings might have robots as friends．
| A．preference | B．intelligence | C．exhibition | D．communication |
As second-hand smoking is more harmful and dangerous, people want a total _____against smoking in public．
| A．ban | B．brake | C．breakthrough | D．boundary |
-- I didn't realize how popular the restaurant was until I made a reservation the other day.
-- I beg your pardon, but when __________?
| A．was you realized it | B．it was that you realized it |
| C．you realized it | D．was it that you realized it |