—Do you think the thief entered through the back door? —No, if he had, I don’t believe he ______ the living-room window.

We ________ the difficulty together, but why didn’t you tell me?

----____ I take the book out? ---- I’m afraid not. 

Whale beachings（搁浅）_______ be caused by factors such as illness, or disorientation（迷失方向）caused by extra noise in the oceans, ______ shipping or oil and gas drilling.

Harry is feeling uncomfortable. He _____ too much at the party last night.