Not until I came home last night _________ his homework．He was very tired．

did my child finish

my child did finish

my child finished

finished my child

Japan often takes earthquake education seriously, which may be _________ the Japanese have shown much calm in the face of the earthquake．

what

because

how

why

The plan _________ just because people were unwilling to work together．

broke down

pulled down

turned down

put down

The flowers, _________ sweet, appeal not only to the young but also to the old．

being smelt

smelt

smelling

having smelt

Was it on the morning of Christmas _________ your little sister received a gift?

when

that

before

as

In America, about half of houses use natural gas to stay warm, and that number _________．

increased

has been increasing

has increased

had increased

A survey of the opinions of experts _________ that three hours of outdoor exercise a week _________ good for one's health．

show; are

show; is

shows; are

shows; is

We are all invited to Tom's birthday party _________ at his house next Sunday．

held

holding

to be held

being held

_________ is often said, language learners should study languages actively, independently, and purposefully．

Which

What

It

As

Please remain _________ and keep your seat belts fastened．

seating

to seat

seat

seated