33．---- I'll be waiting for you at home.　

---- ____ I were busy and couldn't come?

A．What if

B．What when

C．How if

D．How when

32．The difficulty we now meet with is ____ we can persuade him to tell the truth.

A．whether

B．that

C．what

D．how

31．The boy was criticized for forgetting ____ his textbooks to school.

A．bringing

B．to bring

C．having brought

　D. to have brought

30．I saw some trees ____ the leaves were black with disease.

A．where

B．of which

C．in which

D．whose

29．That will be the second cigarette he ____ today.

A．smoked

B．has smoked C had smoked

D．would smoke

28．C　 harles Battage is considered ____ the first computer.

A．to have invented

B．inventing

C．to invent

D．having invented

27．---- Who can take me there?

----____.

A．I

B．Me

C．My

D．Mine

26．He listened attentively to me ____ while____　 at me.

A．spoke, stared

B．speaking, staring

C．spoke, staring

D．speaking, stared

25．B　 ad habits, ____ formed, are difficult to get rid of.　

A．and

B．once

C．or

D．but

24．There are No 2 trolley-bus and No 24 motor-bus; ____ will take you there.

A．both

B．either

C．all

D．any