1 . Peter has previous experience, ______ I think he’s the right person for the job.

A．or	B．but
C．for	D．so

2 . It is more important than ever to develop one’s maths, science and computer skills _______technological change is accelerating.

A．though

B．unless

C．until

D．because

3 . Working as a manager, Rebecca found it hard ______ between work and her family.

A．balancing	B．to balance
C．to have balanced	D．having balanced

4 . 1 think we'd better keep to the subject,       we'11 waste our time．

A．and

B．or

C．but

D．so