------Is there anything wrong , Bob? You look sad.
------ Oh, nothing much. In fact, I ______ of my friends back home.
| A．have just thought | B．was just thinking |
| C．would just think | D．will just be thinking |
The girl ______ is the tallest in our class sat next to me.
| A．who | B．whom | C．which | D．what |
I can't wait __________ them.
| A．surprising | B．surprised |
| C．to surprise | D．surprise |
The subject________ he is interested is English.
| A．which | B．in which |
| C．at which | D．that |
My father is hard ______ me.
| A．to | B．with | C．of | D．on |
Upon _____ at the airport, we were given a warm welcome by the people there.
| A．arriving | B．arrive |
| C．we arrived | D．arrived |