I got to the office earlier that day, _______ the 7:30 train from Paddington.
The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.
My grandfather is always thinking for others. In another word, he is always ________.
Driving on the road, drivers do ______ the traffic rules, which is responsible for themselvesas well as others.
—Won’t you go to the football tonight?—________.I might stay at home watching it live on TV instead.
—Please let me know where David is. I couldn’t find him anywhere.—Well, he _____have gone far—his coat’s still here.