1)、By the time you arrive in London,we_____(stay)in Europe for two weeks.

will have stayed

注意arrive的一般時(shí)態(tài)表示將來(lái)的動(dòng)作。

2)、The first two factors must be equal for all who are being compared,if any comparison in terms of intelligence____(make)

is to be made

be(am/is/are;was/were)和不定式連用，可以表示多種意思，并常用于條件從句(如果想要……)。

3)、While you were in London that year,the London Bridge_____(repair).

was being repaired

while+主語(yǔ)+謂語(yǔ)(一般過(guò)去時(shí)或過(guò)去進(jìn)行時(shí))表示過(guò)去某段時(shí)間內(nèi)主語(yǔ)的狀態(tài)或正在進(jìn)行的動(dòng)作，所以主句謂語(yǔ)應(yīng)用過(guò)去進(jìn)行時(shí)。

4)、John is’t a diligent student,for it is the third time he____(be)late,isn’t it?

have been

在it is the third time的句型中常用現(xiàn)在完成時(shí)。

5)、John always works in his lab and makes a lot of experiments,He___(make)experiments all afternoon and____(not finish)yet.

have been making

have not finished

6)、It___(be)very cold lately,but it’s beginning to get a bit warmer.

has been

注意lately，表示“近來(lái)”recently。