She will tell us why she feels so strongly that each of us has a role ________ in making the earth a better place to live on．

to have played

to play

to be played

to be playing

Mother will wait for him to have dinner together, no matter ________．

how late is he

how late he is

how is he late

how he is late

－You've left the light on．

－Oh, so I have．________ and turn it off．

I'll go

I go

I'm going

I'm going to

You can hardly imagine the difficulty the woman had ________ her children．

brought up

to bring up

bringing up

bring up

In order to beautify our city, ________．

it is necessary to plant more trees

more trees need planting

our city needs more trees

we must plant more trees

－Was his father strict with him when he was at school?

－Yes．He had never praised him ________ he became one of the top students in his grade．

after

unless

until

when

Every minute should be made use of ________ for the coming exam．

preparing

to prepare

prepared

prepares

－English has a large vocabulary, hasn't it?

－Yes．________ more words and expressions and you will find it easier to read and communicate．

To know

Knowing

Know

Known

My sister Lucy is ________ different from me in looks, although we are twins．

exactly

entirely

simply

hardly

－Why are you so happy?

－It's ________ my grandma is going to come to see me．

because

since

as

for