Chatting online can be ________fun, but kids must be sure they stay safe on ________ web．

不填; a

a; the

不填; the

a; a

－You mean the position is still vacant?

－Yes, but you must know our job is very demanding．

－________．

With pleasure

I don't mind

Don't mention it

That's all right

The policeman told me that I had passed the driving test and never in my life ________ so happy and excited．

I felt

did I feel

I had felt

had I felt

________ along with host families, I believe, language travel students are likely to get enough language practice．

Stay

Having stayed

Staying

To stay

－Will it take me long to get to the Sunshine Hotel?

－No, it ________ take you long．It's not the rush hour now．

shouldn't

shan't

mustn't

needn't

To keep safe ________ an earthquake, you should remain at a spot in your room where nothing may fall on you．

in search of

in advance of

in terms of

in case of

I can hardly remember any occasions ________ I get caught in a traffic jam in our town．

which

that

where

when

The process of producing electricity may also give out CO₂, ________ you heat your house with electricity instead of charcoal．

even if

as long as

as if

as soon as

－How much of the foreign expert's speech have you understood?

－Next to nothing．I wish I ________ harder at English．

worked

had worked

would work

were working