I wonder if it's ________ I haven't been able to be outdoors for so long ________ I've grown so crazy about everything to do with nature．

because; that

that; that

why; that

that; because

While ________ the dog, you were careless and it was hit by a car．

walk

walks

walked

walking

Two years ago she bought an expensive mountain bike and then she persuaded me to buy ________．

it

that

this

one

________ of the 16^th century, about five to seven million people spoke English．

In the end

At the end

By the end

On the end

We ate ________ early supper and went to see a temple with floors made of ________ silver．

the; a

不填；不填

an；不填

a; the

Was it eleven o'clock ________ you arrived home last night?

when

that

since

while

When ________, the museum will be open to the public next year．

completed

completing

being completed

to be completed

________ right away, you would arrive there by 5 o'clock p.m.．

Would you leave

Will you leave

Were you to leave

If you'll leave

Not until ________ his cap ________ him．

did he took off; I recognized

he took off; I recognized

he took off; did I recognize

did he take off; did I recognize

________ more about university courses, please call our hotline：(020)8769253．

To find out

Finding out

Find out

Having found out