_____ she was sick, I was expected to take his place greatly surprised me, for I didn’t have much work experience.
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.
--- In what way will you use your portable computer?--- I’ll use it _____ for giving lectures at home and abroad.