This is Big Ben. It's very old.________ it's very tall.

A．But

B．And

C．Or

I didn't realize she was a famous film star she took off her dark glasses. （    ）

A．until

B．when

C．after

D．as

选词填空。
on, in, at, with, and
on, in, at, with, and
1. I can't wear shorts ________ a party.
2. I can wear the sweater ________ Wednesday.
3. The trousers ________ the T-shirt are good.
4. The shirt looks nice ________ a skirt.
5. I can wear it ________ the morning.

The climate is getting from bad to worse people pollute the environment.  (   )

A．if

B．and

C．because

D．but

Air has no smell taste．（    ）

A．and

B．or

C．of