The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
—Hurry up!Alice and Sue are waiting for you at the school gate. —Oh!I thought they ________ without me.
We arrived at work in the morning and found that somebody ________ into the office during the night.(2011·江西)
By the time Jack returned home from England,his son ________ from college.(2011·辽宁)
In the last few years thousands of films ________ all over the world.
— Alvin,are you coming with us? —I'd love to,but something unexpected ________.