The wild flowers looked like a soft orange blanket _____ the desert.

    A. to cover     B. covered          C. cover                D. covering

 _____ the police thought he was the most likely one, they could not arrest him since they had no exact proof about it. 

    A. Although         B. As long as           C. If only          D. As soon as 

 _____ by the advances in technology, many farmers have set up wind farms on their land.

A. Being encouraged                     B. Encouraging

C. Encouraged                           D. Having encouraged

 Lack of money led the company to a situation _____ they had to decide whether they should keep on with their production.

A. when         B. where                C. that             D. which

 Do you consider it any good _____ psychology?

    A. to learn     B. to have learned      C. learning         D. having learned

 You and I could hardly work together, _____?

    A. could you        B. couldn’t I          C. couldn’t we         D. could we  

 Please do me a favor —_____ my friend Mr. Smith to Youth Theater at 7:30 tonight.

    A. to invite        B. inviting             C. invite               D. invited    

 The computer was used in teaching. As a result, not only _____, but students became more interested in the lessons.

A. saved was teachers’ energy              B. was teachers’ energy saved

C. teachers’ energy was saved              D. was saved teachers’ energy

 He told us whether _____ a picnic was still under discussion.

A. to have      B. having               C. have                 D. had

 The strange man asked me to hand the letter to _____ I met in the police station, saying it was very important.

    A. whoever      B. whatever         C. whichever            D. whomever