It was _____ he came back from Africa that year _________ he met the girl he would like to marry.
All the members of the WTO should follow the ______ of trust and fair(公平) trade.
In our class there are 46 students, ______ half wear glasses.
Tom took a taxi to the airport, only ______ his plane high up in the sky.
New technologies have made ______ possible to turn out new products faster and at a lower cost.
Not only I but also Jane and Marry ______ tired of having one examination after another.