Foreign visitors will be amazed ______ the art work of three cowboys on horseback ______ a crowd of cows back home along a road on the Rocky Mountains on one broad maple leaf.
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.
If he takes on this work, he will have no choice but ______ an even greater challenge.