By the time he was ten, Edison _________ experiments in chemistry.
| A．had already done | B．already had done |
| C．was already doing | D．already did |
Where would you like to go for your summer holiday，Beijing or Shanghai？
__________．I will go to Sanya in Hainan．（ ）
A．BothB．EachC．NeitherD．Either
It's dangerous for you to go out for a walk in the forest ___________ at night．（ ）
A．on businessB．by the way
C．on your ownD．on the top
Drivers should drive ___________ when they are passing by a school．（ ）
A．terriblyB．quicklyC．slowlyD．freely
Bill will be a/an ___________ to interview the football players in the coming Rio 2016 Olympics．（ ）
A．guestB．reporterC．touristD．engineer
I'll have an important meeting this weekend，so I can't go fishing with you．
___________．I thought we could have a nice time together．（ ）
A．It's a pleasureB．You're welcome
C．What a pityD．I am sure