—__________. I've just arrived
A. That's no trouble
B. You are welcome
C. That's all right
2. — The trip ought not to take more than an hour.
— ____________ . It is at least two hours.
A. I guess so
B. You must be joking
C. It depends
3. _____ there is smoke, there is fire.
A. If
B. When
C. Where
4. The reason _____ he was absent from class yesterday was that he was ill and hospitalized.
A. for
B. why
C. that
5. Their economy is export ______.
A. oriented
B. orientating
C. orientation
