When and where to go for the on-salary holiday _____ yet.
A. are not decided B. have not been decided
C. is not being decided D. has not been decided
The water will be polluted unless some measures _____.
A. will be taken B. are being taken C. are taken D. were taken
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
