1.   If there is a mechanical problem, we suggest_______the manufacturer directly.

     A. contact                         B. to contact                          C. contacting                         D. to contacting

2.   I suggest you _______Ha Long Bay. It’s very picturesque.

     A. to visit                          B. visiting                              C. visited                               D. should visit

3.   The professor suggested he _______ the research before March.

     A. summit                         B. summiting                         C. summits                            D. summited

4.   Her leader suggested _______ on time.

     A. being                            B. be                                       C. is                                        D. that being

5.   My roommate suggested that  _____ more vegetables and fruit.

     A. we would eat               B. we eating                          C. we ate                                D. we eat