—Where is your mother， Jack?
—She is busy ____ a cake. I will have a birthday party tonight.
| A．make | B．made | C．making | D．to make |
---- Do you know Jack well?
---- Certainly, we _________ friends since ten years ago.
| A．were | B．have made | C．have become | D．have been |
The box is too heavy for me _________.
| A．carrying | B．carries | C．carry | D．to carry |
It _________ rain this afternoon, but I am not sure.
| A．will | B．can | C．must | D．may |
_________ the help of man-made satellites, we can know what the weather will be like
in the next few days.
| A．Under | B．With | C．Using | D．By |
---- Is the physics problem _________?
---- Yes, I can work it out _________.
| A．easy; easily | B．easy; easy | C．easily; easily | D．easily; easy |