He came to my class every week, but his attitude ______ he was not really interested in the subject.
| A．expressed | B．described |
| C．explained | D．suggested |
I just wonder _____ that makes him so excited.
| A．why it does | B．what he does | C．how it is | D．what it is |
It was not until she got home ___ Jennifer realized she had lost her keys.
| A．when | B．that | C．where | D．before |
It was with great joy _____ he received the news that his lost daughter had been found.
| A．because | B．which | C．since | D．that |
It is these poisonous products_____can cause the symptoms of the flu , such as headache and aching muscles .
| A．who | B．that | C．how | D．what |
—Your hometown is so beautiful!
—Yes. What's more, _ _____ we live there is fresh air there is no in town.
| A．that | B．whether | C．where | D．when |