___________ I toured Zhang Jiajie, I was deeply impressed with its beautiful scenery.
| A．For the first time | B．At first |
| C．It was the first time | D．The first time |
-- I'd like to invite you to a party tomorrow evening.
-- Thank you, but ______ I'll be free I'm uncertain.
| A．while | B．if | C．when | D．whether |
Please remind ______ he said he was coming. I may be in time to meet him.
| A．where | B．when | C．how | D．what |
Adam left word with my wife ______ he would call again in the afternoon.
| A．who | B．as | C．that | D．which |
. -- Do you think Allan came by taxi?
-- No. If he had, I don't believe he ______ his bike here.
| A．would leave | B．left | C．would have left | D．had left |
The road becomes so crowded during rush hours, ______ it becomes a very slow route.
| A．which | B．when | C．where | D．that |