After completing and singing it, please return the form to us in the envelope _________.
| A．provided | B．providing | C．having provided | D．provide |
Over the long process of evolution, animals have developed their ______ senses, which makes it possible for them to _____ their environments.
| A．specially; conquer | B．unique; survive |
| C．uniquely; survive | D．special; exist |
His ability is beyond question; _____ has been in doubt is ____ he is prepared to work hard
| A．what; that | B．which; whether | C．what; whether | D．that; that |
Half of the students will have sports, and the rest _____ to be here in the classroom studying.
| A．is | B．was | C．were | D．are |
She dedicates herself to her work. She is such a dedicated teacher that her efforts will _____.
| A．pay off | B．be fed on | C．pay back | D．be given back |
When she heard that I couldn’t help _____ the problem, the poor girl couldn’t help ____.
| A．to solve; crying | B．solving; to cry |
| C．solving; crying | D．to solve; to cry |