He made another wonderful discovery, _______ of great importance to science.
| A．which I think | B．which I think it | C．which I think is | D．I think which is |
---Why do you look so upset?
---There are so many troublesome problems ____.
| A．remaining to be settled | B．remained settled |
| C．remaining to settle | D．remained to be settled |
It didn’t _____ him that she would refuse his invitation
| A．happen to | B．adjust to | C．belong to | D．occur to |
The seawater takes ____ a lot of heat in summer.
| A．up | B．in | C．over | D．off |
That was the first time I _______ there and I was impressed by the friendly people very much.
| A．go | B．was going | C．had gone | D．have gone |
Jane has been so _______ in getting used to everything that she hasn’t had time for social activities.
| A．confused | B．worried | C．devoted | D．occupied |