Never keep ________ with dishonest persons．

company

track

touch

pace

We all hope to ________ time on the return journey by not stopping at night．

take up

make up

end up

fill up

In the park, the number of visitors is tightly ________ to avoid damaging the environment or putting stress on the animals．

limited

encouraged

expected

intended

This picture was taken a long time ago．I wonder if you can ________ my mother．

find out

pick out

look out

speak out

He got well-prepared for the job interview, for he couldn’t risk ________ the good opportunity．

losing

to lose

to be lost

being lost

Anyone ________ bags, boxes, or whatever, was stopped by the police．

seen carry

seen carrying

saw to carry

saw carrying

The great millionaire gave away all his fortune to the charity and lived a simple life， ________．

happy and content

happily and content

happily and peaceful

happy and peace

While dancing happily at home, ________．

the door bell rang

the door bell rings

we heard the door bell rings

we heard the door bell ring

Some people argue using ________ nature to meet our own needs may spell disaster, unless we start to look around and understand how ________ clean environment benefits us all．

/; a

the; the

the; a

a; a

His failure in the exam suggested that he ________ the teacher's instructions．

can't have followed

needn't have followed

mustn't have followed

shouldn't have followed