－Do you know ________?－Yes．She is doing her homework．

what is your sister doing

what your sister is doing

when your sister is doing homework

where is your sister doing homework

Waste paper ________ everywhere．It's our duty to keep the school clean．

throws

are thrown

shouldn't be thrown

should be thrown

My pen pal said he would write to me, but I ________ any letters from him so far．

won't receive

haven't received

hadn't received

didn't receive

－Lin Kai, hand in your homework, please．

－Oh, sorry．I ________ it at home this morning．

was leaving

has left

will leave

left

－Whose home is ________ away from school in our class?

－Liu Mei's．

father

far

the farthest

near

The girl ________ the woman．Maybe she is her daughter．

take care

takes after

takes off

look after

－Your bedroom is so dirty．Would you please ________, Peter?

－OK, mum．I'll do it right away．

set it up

put it on

pick it up

clean it up

We went to the beach last Sunday, and we had great fun ________ volleyball．

play

playing

played

to play

－Lily,________ do you study for a math best?

－By asking my teacher for help．

how

who

why

what

－Tom, you look tired this morning．What's wrong?

－I was so busy that I didn't go to bed ________ 12 o'clock last night．

until

when

though

unless