Not until he arrived home _____ he find that this wallet had been stolen.
| A．did | B．would | C．when | D．that |
His way of speaking suggested that he ____ very angry.
| A．should be | B．be | C．is | D．was |
Pine trees, of which there are almost one hundred _____, are found throughout the North Temperate Zone.
| A．species | B．samples | C．specimens | D．Standards |
The salmon dish was _______, wasn’t it?
| A．success | B．the success | C．a success | D．successes |
The conference had been held to discuss the effects of tourism ___ the wildlife in the rainforest.
| A．in | B．on | C． at |
D．with |
Specialists may be useful to _____ a situation and suggest solutions.
| A．analytical | B．analyze | C．analysis | D．analyst |