There are so many kinds of pens in the shop that I can’t decide________．
A．when to buy
B．where to buy
C．what to buy
D．which to buy
—Excuse me，could you tell me________a book about science？
—Sure．They are on the second floor．
A．where I can buy
B．where can I buy
C．when can I buy
D．when I can buy
A________day！Don’t you want to go out for a walk with us？
A．beautiful
B．scary
C．disappointing
D．crucial
I hear it’s a________experience to visit the caves and many people go there every day．
A．terrifying
B．fascinating
C．boring
D．frustrating
The hamburger not only smells good but also tastes________．
A．awful
B．bad
C．delicious
D．salty
Don’t open the door to strangers；it’s not________．
A．safe
B．polite
C．convincing
D．embarrassing
