1 . The owner and captain discussed it with _______ colleagues.

A．its

B．their

C．her

D．him

2 . ________camera is not so expensive as________, but it works well, too.

A．My; his

B．Mine; him

C．My; him

D．Mine; his

3 . —What do you think of ________ Chinese teacher?
—She is an excellent teacher. I’ve improved a lot since she taught _____ Chinese.

A．our; us

B．our; our

C．ours; us

D．ours; our

4 . All the students are doing _________ best to study for the exam.

A．they

B．them

C．their

D．themselves