Nowadays ______ Internet is becoming increasingly popular and ______ new high speed broadband network was recently started.

These young trees must ______.

When I opened the door, I found my father _____ in his chair, completely _____ in a magazine [ ]

e immune system weakens, it loses the ability ________ illnesses.

Can I call you back at two o’clock this afternoon? —- I’m sorry , but then I ______ to Beijing How about five ?