Last Sunday I ________ a copy of the English-Chinese dictionary in a second-hand bookstore．

A．ran across

B．ran after

C．ran out of

D．ran up

If we continued to waste our natural resources, it will ________ in time．

A．run after

B．run into

C．run out

D．run from

If you ________ any problems when you arrive at the airport, give me a ring．

A．come up with

B．set about

C．run into

D．put aside

Listen to the two girls by the window．What language ________?

A．did they speak

B．were they speaking

C．are they speaking

D．have they been speaking

Years ago we didn't know this, but recent science ________ that people who don't sleep well soon get ill．

A．showed

B．has shown

C．will show

D．is showing

－Did you see Sandy in the manager's office?

－Yes, she ________ to him why she was late again．

A．is explaining

B．was explaining

C．had explained

D．explained

He was hoping to go abroad but his parents ________ that they won't support him unless he can borrow money from the bank．

A．were deciding

B．have decided

C．decided

D．will decide

Scientists think that the continents ________ always where they today．

A．aren't; are

B．aren't; were

C．weren't; are

D．weren't; were

－Can I help you, sir?

－Yes, I bought this radio here yesterday, but it ________．

A．didn't work

B．won't work

C．can't work

D．doesn't work

He is used to attending evening courses ________ no matter what kind of weather he meets with．

A．normally

B．usually

C．commonly

D．regularly