Let’s talk __________ the weather.—OK.[ ]

Wow! These inventions are amazing．—They were all invented _______years ago.

Could you pass me _____glass on the table please?—Sure, but it’s _____empty one.

He has no pen to write _____, because he left his pencil-box at home this morning.[ ]

Did you get there by ______ bike?—No, I took ______ taxi.