I ______ along the road when I saw Peter. So we stopped and had a chat.
| A．walked | B．was walking | C．would walk | D．had walked |
. Now that energy prices are rising so rapidly, further prices are very uncertain, and the risk ________ a new investment depending on them may fail is greater.
. There are signs ________ restaurants are becoming more popular with families.
| A．that | B．which | C．in which | D．of which |
. There’s a feeling in me ________ we’ll never know what a UFO is – not ever/never.
| A．that | B．which | C．of which | D．what |
. The theory is of great important ________ the hotter a body is, the more it radiates.
| A．that | B．when | C．which | D．what |
. Evidence came up ________ specific speech sounds are recognized by babies as young as months old.
| A．that | B．whose | C．which | D．what |