Don’t you realize the _________ these chemicals are doing to our environment?

shelter

track

damage

outline

This is the only thing _________ I can do now．

what

which

that

all

In hot countries, it’s possible to sleep _________ in summer．

in outdoors

at outdoors

outdoor

outdoors

Would you please _________ the paper for me and see if there are any obvious mistakes．

look around

look into

look up

look through

The plan was in _________ just because people were unwilling to cooperate．

pieces

danger

trouble

ruins

We all have a part to _________ in the fight against crime．

play

take

playing

taking

Rather than _________ on a crowded bus, he always prefers _________ a bike．

ride, ride

ride ,riding

ride ,to ride

to ride, riding

You can never know _________ when she received our nice birthday presents．

how Mary was excited

how excited Mary was

how excited was Mary

Mary was how excited

Anything that _________ Yao Ming interests me all the time．

concerns

matters

concerning

mattering

The party was successful ,but we thought _________ a pity not to have invited you．

its

this

that

it