________ is a good form of exercise for both young and old．

The walk

Walking

To walk

Walk

When I got home, I saw a message pinned to the door, ________ “Sorry to miss you：will call later．”

read

reads

to read

reading

There used to be a map of Scotland on the wall, ________?

did there

didn’t there

wasn’t there

were there

I told her I ________ help when I was free．

was going to

am going to

will

would to

He ________ his leg when he ________ a football match against another school．

broke; played

has broken; was playing

broke; was playing

broke; had played

What he saw and experienced in Paris ________ change his life．

will

should

was

was to

I ________ to bed when the telephone rang：it was my aunt Lucy who was at the airport．

went

would go

had gone

was about to go

By the middle of this century, the majority of the world’s population ________ in cities．

will be living

are living

have lived

will have lived

Julie told me that she ________ take a trip to Guilin the next week．

would

was going to

was about to

was to do

I wonder why Ann ________ to us recently．We should have heard from her by now．

doesn’t write

hasn’t written

won’t write

hadn’t written