We were swimming in the lake _____ suddenly the storm started.
| A．when | B．while | C．until | D．before |
I still remember the days_______ we lived together.
| A．in which | B．which | C．in that | D．that |
I was given three books on cooking, the first ________ I really enjoyed.
| A．of that | B．of which | C．that | D．which |
The boy likes playing jokes on his classmates, __________ of course makes him popular.
| A．which | B．whom | C．for which | D．for whom |
It is difficult, so I suggest that you __ it to an expert.
| A．should leave | B．will leave | C．are leaving | D．may leave |
Luckily, we’d brought a road map, _________ we would have lost our way.
| A．without it | B．with that | C．without which | D．without that |