The car he has driven for five years is ________, because his wife is seriously ill and money is needed．

for sale

on sale

for the sale

on the sale

How I wish it ________!If it ________ in a few days, the crops would be saved．

will rain; rained

would rain; should rain

should rain; rains

would rain; had rained

As is known to all, the Olympic Games are held once ________ four years．

another

any

either

every

The age ________ the rich lords could sit in their castles and feel safe was over when cannons were invented．

when

whose

whether

which

He put his mind ________ his examination papers and didn't notice what had happened outside．

on

at

to

for

Tom ________ a piece of his eraser and gave it to Jack．

broke off

broke down

broke out

broke into

The computer is believed to be a wonderful ________ of the twentieth century．

discovery

invention

finding

engine

Some Arabs brought the knowledge westward, ________ it to the Europeans who absorbed it quickly．

to introduce

introducing

introduced

having introduced

The ear was out of ________ and it hit a tree, turning over and over．

sight

date

control

reach

I ________ in the heavy rain on my way to the cinema．

had caught

was catching

caught

was caught