Which of the following statements about the effect of a contract is correct？
A sales contract is subject to approval before it comes into effect
B. A contract becomes effective upon its formation, unless otherwise provided by law
C. The parties to a contract are not allowed to agree that its effect is subject to certain conditions
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Under which of the following circumstances can an offer be withdrawn by the offeror？
A. The offer has not reached the offeree
B. The offer indicated a fixed time-limit for acceptance, which has passed
C. The offeree has replied to the offeror
Which of the following statements in relation to a non-fixed term labour contract is correct？
A. It may not be dissolved by an employer under any circumstances
B. It shall be concluded where an employee has worked for the employer for a term of at least five years
C. It is a labour contract in which the employer and employee have agreed not to stipulate a definite end date
D. It may not be dissolved by an employee within ten years after the conclusion of such a labour contract
Which of the following statements about labour contracts is correct？
All labour contracts shall include a probation clause
B. The probation period in any labour contract shall not be shorter than three months
C. An employer may dissolve the labour contract during the period of probation
D. The probation period in any labour contract shall not exceed 12 months
Which of the following is allowed to be mortgaged under the Property Law？
A. Fund units and stock rights
B. The right to use construction land
C. Intellectual property
D. Receivables
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