Debbie ________ to college last year．Unfortunately, she didn't take the examination because of a sudden illness．

could go

can't have gone

could have gone

must have gone

The reason why this book ________ is that it is popular with students．

is sold well

is well sold

sells well

has been sold well

On Sundays, I like to ________ the town on a bike with my daughter．It's really relaxing．

get out

get away

get along

get around

We had a long wait, but it was ________ because we got the tickets in the end．

favourable

precious

worthwhile

essential

It doesn't matter what you do and how much you earn ________ you are happy．

as long as

unless

even if

although

________ for several hours, they came to realise that they had a lot in common．

Having chatted

chatted

To chat

Chatting

Nowadays ________ number of students with mobile phones at school is on ________ increase．

a,×

a, the

the, the

the,×

It is hard to say what kind of person he is．Sometimes he is very friendly; at other times he ________ be very cold．

can

must

will

shall

In my opinion, ________ matters is not one's looks, but one's inner thoughts．

that

it

what

this

________ computers are convenient to us in daily life, it may also cause other problems．

Whether

Because

As

While