Children usually ________ their parents for food and clothing．

turn into

live on

ask for

rely on

Without proper lessons, you could ________ a lot of bad habits when playing the piano．

give up

catch up

keep up

pick up

If you want, you can ________ BBC English programmes clearly on the radio．

picking up

picks up

pick up

pick

The computer center, ________ last year, is very popular among the students in this school．

open

opening

having opened

opened

Some new oilfields ________ since 1976．

were opened up

has been opened up

have been opened up

had been opened up

John was so sleepy that he could hardly keep his eyes ________．

open

to be opened

to open

opening

A notice was placed by the thin ice, ________ people ________．

warned; keep away

warning; to keep off

to warn; to keep out

warn; to keep up

The storm kept me ________ the meeting last Sunday．

attend

attending

from attending

for attending

He is not easy to get along with, but the friendship of his ________, will last forever．

once gained

to be gained

after gained

while gaining

I would appreciate it ________ you call back this afternoon for the doctor’s appointment．

until

if

when

that