-- If the traffic hadn’t been so heavy, I could have been back by 6 o’clock.-- What a pity! Tina ________ here to see you.
With the living expense increasing rapidly, I, a fresh clerk in a company, have to take three part-time jobs, which _____ about extra $ 4,000 a year.
Most of us think of games as child* s play, but games _____ children' s thinking and develop skills like problem solving and communication.
In a courtroom it is sometimes difficult to ______ who is innocent and who is guilty.
Future will be a marvelous world of artificial ______----- robots might have their emotions and we human beings might have robots as friends.
As second-hand smoking is more harmful and dangerous, people want a total _____against smoking in public.