He had to pause from time to time to wipe the sweat from his forehead, because the air-conditioning system _________.
| A．broke in | B．broke up | C．broke out | D．broke down |
As many as five courses are provided，and you are free to choosesuits you best．
| A．whatever | B．whichever |
| C．whenever | D．wherever |
Knowledge from real life isn't easier to forget thanachieved from textbooks.
| A．one | B．it |
| C．that | D．those |
By 16：30，was almost closing time, all the paintings had been sold out．
| A．which | B．when |
| C．what | D．that |
—I’m disappointed the experiment turned out to be complete failure again．
—Don’t lose heart．Try third time．
| A．the；a | B．a；the |
| C．a；a | D．不填；the |
We’re leaving the seaside city for home. Do you have any sea products here?
| A．to buy | B．bought |
| C．to be bought | D．buying |