Directions: Beneath each of the following sentences there are four choices marked A, B, C and D. Choose the one answer that best completes the sentence.

45．Some passengers complain that it usually 　　　　　so long to fill in travel insurance documents.

　　　 A．costs 　　　　　　　　　 B．takes 　　　　　　　　 C．spends 　　　　　　　　 D．spares

44．There is a new problem involved in the popularity of private cars 　　　　　road conditions

　　 need 　　　.

　　　 A．that　 to be improved 　　　　　　　　　　　　 B．which　 to be improved

　　　 C．where　 improving 　　　　　　　　　　　　　 D．when　 improving

43．An army spokesman stressed that all the soldiers had been ordered 　　　　　clear warnings

　　 before firing any shots.

　　　 A．to issue 　　　　　　　 B．being issued 　　　 C．to have issued 　　　 D．to be issued

42．-Dad, I’ve finished my assignment.

　　 -Good, and 　　　　　you play or watch TV, you mustn’t disturb me.

　　　 A．whenever 　　　　　　 B．whether 　　　　　 C．whatever 　　　　　　 D．no matter

41．I can think of many cases 　　　　　students obviously knew a lot of English words and

　　 expressions but couldn’t write a good essay.

　　　 A．why 　　　　　　　　　 B．which 　　　　　　　 C．as 　　　　　　　　　　　 D．where

40．It is pretty well understood 　　　　　controls the flow of carbon dioxide in and out the

　　 atmosphere today.

　　　 A．that　 　　　　　　　　　 　B．when 　　　　　　 C．what 　　　　　　　　　 D．how

39．Generally speaking, 　　　　　according to the directions, the drug has no side effect.

　　　 A．when taking 　　　　 B．when taken 　　　 C．when to take 　　　 D．when to be taken

38．Only when your identity has been checked, 　　　　.

　　　 A．you are allowed in 　　　　　　　　　　　　　　　 B．you will be allowed in

　　　 C．will you allow in 　　　　　　　　　　　　　　　　 D．will you be allowed in

37．The discovery of new evidence led to　　 .

　　　 A．the thief having caught 　　　　　　　　　　　 B．catch the thief

　　　 C．the thief being caught 　　　　　　　　　　　　 D．the thief to be caught

36．It is these poisonous products 　　　　　can cause the symptoms of the flu, such as headache

　　 and aching muscles.

　　　 A．who 　　　　　　　　　 B．that 　　　　　　　　　 C．how 　　　　　　　　　 D．what