—Is Jack on duty today? —It_____ be him. It’s his turn tomorrow.
The shopkeeper didn’t want to sell for __he thought was not enough . A where B. how C. what D. which
The place __ the bridge is supposed to be built should be ____the cross-river traffic is the heaviest .
Mary wrote an article on ____the team had failed to win the game .
After Yang Liwei succeeded in circling the earth ,___our astronauts desire to do is walk in space .
we can not figure out ____quit a number of insects ,birds ,and animals are dying out .