---Come and lend me a hand! I can’t manage all this stuff. ---I’m sorry. ___ .
John’s success has nothing to do with good luck. It is years of hard work _____ has made him what he is today.
We were about to go out for a walk ________ it began to rain.
_____ you’ve got a chance, you had better make full use of it.
Sam _____ some knowledge of the computer just by watching others working on it.
Children who are not active or diet is rich in fat will gain weight quickly.