_____ of the students who took part in the military training is 450.
| A．A number | B．A lot | C．Lots | D．The number |
—Must we get everything ready before we go to the countryside this summer? —No, you _______.
| A．mustn’t | B．won’t | C．don’t have to | D．can’t |
_______ entering the classroom, remember to take your seat and turn off your cell phone.
| A．At | B．From | C．Upon | D．As |
I worked as hard as I could _______ for the final exam.
| A．to prepare | B．prepare | C．preparing | D．prepared |
Not only I but also Jane and Mary _______ tired of doing the same thing all the time.
| A．is | B．are | C．am | D．be |
Getting _______ in the forest is very dangerous.
A. losing B to lose C. lost D. being lost