Tom isn’t _________ Jack．

While reading, Helen has a habit ofstopping _____ to give her long and flowing hair a smooth.

Remember that you won’t be able to cancel the contract ____you’ve signed.

it’s already 6 o’clock I have to be off foran appointment –OK ________

(2014·蚌埠九中模拟)General secretary Xi Jinping urged Washington ________ concrete measures to loosen hightech export controls to China.