I don't like sports. I am not playing football. (    )

A．well

B．good at

C．do well

I play basketball ________Sundays. (   )

A．on

B．in

C．at

It’s time ____sleep

A．in

B．on

C．to

_______ Tuesday's maths class, Sam helps Tim. (   )

A．In

B．At

C．On

用适当的介词填空。(6分)
（1）We should be good________ animals.
（2）There are all kinds________ flowers on our planet.
（3）Mary's birthday is ________May.
（4）Pandas live  ________   the southwest  ________   China.
（5）Tom often goes to the library  ________   his friends.
（6）African elephants come________Africa.