4. By the end of this month, we surely ______ a satisfactory solution to the problem.
A. have found
B. will have found
C. will find
D. will be finding
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5. The doctor insisted that his patient ______ the medicine.
A. take
B. takes
C. to take
D. taking
6. ______ they will not come to join us, we have to change our plan.
A. seeing that
B. for
C. when
D. As soon as
7. Since the family moved here last year, they ______ better health.
A. were enjoying
B. had enjoyed
C. have been enjoying
D. enjoyed
8. Living in the Central Australian desert has its problems, ______ obtaining watering is not the least.
A. of which
B. for what
C. as
D. whose