________cash crops will be produced next year is not yet decided.
| A．It | B．What . | C．That | D．Which |
Being a teacher, you must observe your behavior, for ________ you say and do has a life-long effect on your students.
| A．that | B．which | C．what | D．as |
He made another wonderful discovery, _______ of great importance to science.
| A．which I think is | B．which I think it |
| C．which I think it is | D．I think which is |
At first I insisted to go with Rose and Peter, but when I realized they wanted to be alone together so I felt very _______ and uncomfortable.
| A．amazed | B．curious | C．amused | D．awkward. |
My birthday ________next week, I’m busy preparing for a big birthday party, planning to invite all my best friends.
| A．to come | B．coming | C．comes | D．is coming |
After completing and signing it, please return the form to us in the envelope ________.
| A．providing | B．provided | C．having provided | D．provide |