—Did they have fun _______ the summer Palace ?
—Yes. They really enjoyed themselves there.
| A．visit | B．visited | C．to visit | D．visiting |
Frank wanted to learn to play _______ guitar, but he didn’t have _______ guitar.
| A．the ; the | B．a ; the | C．the ; a | D．a ; a |
There are a lot of colorful flowers on __________ side of the street.
| A．all | B．both | C．either | D．every |
It’s hot outside, please keep the door __________.
| A．open | B．close | C．opened | D．closed |
I didn’t know he came back __________ I met him in the street .
| A．since | B．when | C．until | D．after |