But at other moments you will find him gentle and weak, _____ he cries about the lost lives of people drowned in ships that have sunk.
| A．as with | B．as for | C．as to | D．as when |
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 |
It_____ have been Tom that parked the car here, as he is the only one with a car.
| A．may | B．must | C．can | D．should |