【推荐1】—Lucy, will your parents come here?
—It’s raining now. I don’t know _______ they will come or not.

A．if

B．when

C．whether

【推荐2】See _________ your invention works as it is planed. If not, do more research, redesign it.

A．since

B．after

C．until

D．if

【推荐3】It's so quiet here! We can hardly believe ________ we're in the city centre.

A．what

B．if

C．that

D．where

【推荐1】—Does your brother have a good football?
—Yes. He has a very good ________

A．one

B．it

C．two

D．that

【推荐2】I don’t think ________ possible to master a foreign language without much memory work.

A．this

B．that

C．it

D．its

【推荐3】After the new high-speed railway line began operations (运行), the time on the trip from Beijing to Guangzhou now is much less than ________ in the past.

A．that

B．it

C．one

【推荐1】________ you are in trouble, you can ask the policeman for help.

A．Whenever

B．Whatever

C．However

【推荐2】_____ you do, don’t miss this exhibition, for it’s so hard for me to get the tickets.

A．Whatever	B．However
C．Whenever	D．Whether

【推荐3】You’ll not be allowed to enter public places ________ health codes are shown.

A．if

B．after

C．unless

D．whenever

【推荐1】We're not sure ________it will rain or not tomorrow.

A．if

B．whether

C．that

D．why

【推荐2】Could you tell me ________ we are going skating the day after tomorrow or not?

A．because

B．when

C．whether

【推荐3】—Mary, will your father come here?
—It’s raining now. I don’t know ________ he will come or not.

A．whether

B．if

C．how