I really don’t know _____ I put my wallet after I paid the bill.

Thousands of years ago people discovered the phenomenon by chance, and this was _____ the idea of the compass first came from.

---Did Mark win the 100-meter race? ---     . He did _____ I.

Only when you told me about it ________ what a silly thing I had done.

Not only _____ our suggestions he _____ late together with us but he also started out alone at once.

     is reported in the newspaper is that seventeen climbers have been killed in the snow storm 

At the meeting place  of the Yangtze River and Jialing RIiver    ,one of the largest cities in china.

There is ________ in population that a food shortage is caused.

 Under no circumstances, he was warned, _____ to give the password to someone else.

What’s the noise ? It sounds as if it comes from upstairs.   --______. It must be the window-cleaner working , next door.         

Not until the car looked almost new____ cleaning it.1网

Looking out of the window of my room, ___ a tall tree in the yard.

Only after the woman had her own child, _____ how difficult it was to be a mother.

There is no doubt ______ he will not be admitted to the room.

Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.

It is ____ that I’d like to go for a picnic.

______ make her father angry, Joan didn’t tell him her poor grade.

Was it in the hotel _____ my father works _____ you met the film star the other day?

It is known to all that every minute ____ full use of____ the lessons will benefit students a great deal．

 He would rather ______ his mother the truth.