He made another wonderful discovery, _______________ of great importance to science.
| A．which I think is | B．which I think it is | C．which I think it | D．I think which is |
—— I can’t get through to the general manager’s office anyhow.
—— The line is busy. Someone _____ the telephone.
| A．must use | B．uses | C．must have been using | D．must be using |
I don’t think the snow will _____ our plans for a picnic.
| A．affect | B．effect | C．infect | D．influence |
Sarah hopes to become a friend of _____ shares her interests.
| A．anyone | B．whomever | C．whoever | D．no matter who |
Phillip, can you see something red _____ in the distance on the water?
| A．Floated | B．float | C．being float | D．floating |
The traffic light is red, so I _____stop my car.
| A．must | B．have to | C．can | D．mustn’t |