______ it rain tomorrow, we would have to put off the visit to the Water Cube.

_______,when Marx was already _______,he found it was important to study the situation in Russia, so he began to learn Russian.

Itwas _____ he came bank from Africa that wear _________ he met the girl he wouldlike to marry.

The stone is ______ heavy ______ I can’t carry it.

Sitting at the back of the room but infront of some old men and women ______ a very shy girl with two bright eyes.