As is said, it won't be long ________ we participate in the 4^th Huaian United Exam．

since

when

before

that

Look, ________ the children are having in the games!

what a fun

what fun

how funny

how fun

The sign reading "No Photos" means that no one ________ take any photos in the Palace Museum．

need

might

must

shall

The little boy entered the classroom without ________．

noticing

noticed

being noticed

notice

Taobo is Asia's largest retail(零售的)network platform, ________ people can buy and sell many kinds of things．

where

when

that

whose

Remember ________ the lights when you leave the house．

to turn off

turning off

to turn on

turning on

I know my brother well．Once he has made up his mind, nothing can change it, but instead I usually ________

give off

give away

give out

give in

After he retired from office, Rogers ________ painting for a while, but soon lost interest．

took up

saved up

kept up

drew up

It was ________ cold day that they had to put on more clothes．

such a

such

so

so a

Word comes that free souvenirs will be given to _________ comes first．

no matter who

whoever

no matter whom

whomever